Put the verb into the correct form, present perfect or past simple.

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it is carelessly used. A fault installation or a defective piece of equipment can cause a serious fire and there is also a danger of an electric shock.

Many precautions are taken and safety devices are used to minimize these dangers.

The most common safety device used in every household installation the ordinary fuse. This is simply apiece of wire which is connected in series in the circuit. It is of such resistance that it will melt and therefore break the current, if the current flowing in the circuit exceeds a certain amount. \Vhen it happens, we say the fuse "blows".

б) Найдите герундий и переведите предложения на русский язык:

1 . A capacitor is used for storing electricity.

2. Marconi was only twenty-one years old when he succeeded in transmitting signals by radio waves.

3. You can get an electric shock by touching a faulty apparatus.

в) Выберите требуемую форму глагола и переведите предложения на русский язык:

1 . If the terminals of a battery are connected by a metal wire, the free electrons (will flow, would flow) towards the opposite terminal.

2. If a fault developed inside apparatus, a person (would get, would have got) an electric shock.

3. If you had increased the cross section of the conductor, you (would decrease, would have decreased) its resistance.

г) Ответьте на вопросы:

1 . What is the most common safety device?

2. What happens when the current exceeds a certain amount?

3. When do we say that the fuse "blows"?

8. Вставьте предлоги по смыслу:

1. Russia is washed ... three oceans and twelve seas.

2. The first manned spaceship piloted ... the citizen ... Russia Yuri Gagarin was launched ... April 12, 1961.

3. Russia is very rich ... natural resources.

4. A fuse is apiece . . . wire which is connected ... series ... the circuit.

(stop)

The town is very different now. It has changed a lot. (change)

a) I did German at school, but I ....................................... most of it now. (forget)

b) The police ....................................... three people, but later they let them go. (arrest)

c) What do you think of my English? Do you think it .......................................? (improve)

d) A: Are you still reading the paper?

B: No, I ....................................... with it. You can have it. (finish)

e) I ....................................... for a job as a tourist guide, but I wasn’t successful. (apply)

f) Where’s my bike? It ....................................... outside the house, but it’s not there now. (be)

g) Look! There’s an ambulance over there. There ....................................... an accident. (be)

Then and now
Twenty years ago few people realized (realize) that computers were about to become part of our daily lives. This short period of time has seen (see) enormous changes, in business, education and public administration. Jobs which _________________(take) weeks to complete in the past, are now carried out in minutes. Clerks who _______________ (spend) all day copying and checking calculations are now freed from these tedious tasks. In offices, the soft hum and clicking of word processors_________________(replace) the clatter of typewriters. Schoolchildren ____________________ (become) as familiar with hardware and software as their parents _________________ (be) with pencils and exercise books. Computerization of public records __________________ (enable) government departments to analyze the needs of citizens in details. Some of us may wonder, however, whether life ______________ (really/improve) as a result of these changes. Many jobs __________________ (disappear), for example, when intelligent machines ________________ (take) over the work. Employers complain that clerical staff ______________ (become) dependent on calculators and cannot do simple arithmetic.

1. I ______ (just/ get) a letter from my friend.
2. I think I ________ (already/ do) a lot of important things in my life.
3. Jake ____________ (finish) his homework at 6 pm. It _______ (take) him an hour to do it.
4. Nelly ___________ (yet/ finish) her taks __________.
5. I __________ (read) a lot when I was at school.
6. Steve __________ (yet/ read) this book __________.
7. _________ you _________ (watch) the football match yesterday?
8. My mother ___________ (do) the shopping today.

We produce (to produce) a lot of rubbish (=litter) from homes, schools, factories, offices and hospitals.
The rubbish (1) _______ (to collect).
What happens to rubbish when it (2) _____________ (to take) away?
The rubbish from our bins (3) ______________ (to take) to large holes in the ground (they (4) _________________ (to call) landfills
Sometimes they (5) ____________ (to make) specially for rubbish.
In the landfill hole the rubbish (6) ____________ (to press) using special machinery
Then it (7) ______________ (to cover) with earth
The problem it that there are fewer and fewer places for new rubbish
Besides, rubbish (8) __________ (to cause) environmental damage
Animals and plants (9) __________ (to disturb)
More than that, rubbish (10) __________ (to stay) in the ground for many years
Many materials,for example,plastic, (11) _____________ (not to change) for a long times