помогите перевести предложения на английский

Объясните употребление каждого случая на русском языке.
1. I am very interested ______ the courses you are organizing.
a) on b) in c) to d) for
2. I'm afraid I haven't got ______ change - only a £10 note.
a) any b) a lot c) some d) a
3. They work in offices ______ are air-conditioned.
a) who b) they c) which d) where
4. I'm going to ______ my suit dry-cleaned.
a) make b) have c) take d) let
5. If you don't start watching until 8.30 tonight, the programme ________.
a) will already have begun b) will begin c) has already begun
d) had already begun
6. You can do your own cooking in a ______ apartment.
a) camping b) package c) chalet d) self-catering
7. It's sad that he has ______ friends of his own age.
a) a little b) little c) few d) a few
8. This is the best song ______ so far.
a) I heard b) I've heard c) I hear d) I'm hearing
9. They decided to have a picnic ______ the pouring rain.
a) despite b) on account c) because d) although
10. He didn't want to risk ______ late for the interview.
a) arrive b) arriving c) to arrive d) having arrived
11. I'd love to try and make that cake. Have you got a(n) ______ for it?
a) receipt b) prescription c) ingredient d) recipe
12. His car's in the car park, so he ______ be here.
a) can b) ought c) must d) needs to
13. You'd better see a doctor, ______ you?
a) hadn't b) didn't c) wouldn't d) don't
14. I wish I ______ my letter of application earlier.
a) would write b) had written c) have written d) wrote
15. That's the ______ difficult textbook I've ever used.
a) more b) even c) most d) very
16. Because Denise's parents worked abroad, they sent her to a ______ school.
a) college b) secondary c) training d) boarding
17. The helicopter landed ______ the roof of the building.
a) at b) in c) over d) on
18. I have a monthly bank ______ sent to me, so that I know how much there is in my account.
a) balance b) overdraft c) statement d) cheque
19. Meat can be stored for several months in a home ______.
a) freezer b) fridge c) cool box d) cooler
20. If Jamal ______ on holiday, he'll spend a lot of money.
a) will go b) goes c) would go d) went

l times.2) We (learn) many new words in this course.3) He (make) that same mistake several time.4) I (hear) that story before.5) I am afraid that I (lose) my car keys.6) She (see) this film three times.7) I (tell) John what you said.8) She (return) my book at last.9) She says that she (lose) her new pocket-book.10) I just (mention) it. Please be more attentive.
Употребить глаголы, данные в скобках, в Past Perfect.Перевести предложения на русский язык.1) I was sure that I (see) the man before.2) I asked him why he (leave) the party so early.3) It was clear that he (give) us the wrong address.4) The teacher corrected the exercises which I (prepare).5) He knew that he (make) a serious mistake.6) She said she (look) everywhere for the book.7) I felt that I (meet) the man somewhere before.