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Clouds play a powerful(1)____in warming and cooling our planet. Even a one-percent change in cloud can have dramatic(2)____on global temperature. On the one(3)____, clouds spread out like global umbrellas, blocking the sun's heat energy and reflecting much of it(4)____into space. That cools the planet. But clouds can also act like giant blankets(5)____trap heat radiating from Earth. This(6)____to keep the planet warm and suitable for life. All life processes on Earth depend on a balance(7)____this warming and cooling. If the balance shifts, the effects(8)____be disastrous. Colder winters or hotter summers could threaten entire species of plants and animals, and force whole populations-humans included-to move to different latitudes. Scientists are now studying clouds in an attempt to forecast(9)____climatic changes. They hope to(10)____answers to many questions.

_______________________________________________________________
|__№__|_________a__________|_________b_________|________c_________|
| 1 | part | role | place |
| 2 | reason | effect | source |

| 3 | side | view | hand |
| 4 | out | back | round |

| 5 | which | while | when |
| 6 | has | helps | makes |

| 7 | among | in | between | | 8 | could | must | should | | 9 | so | such | a |

| 10 | look for | put | find |

№2 Choose the right words to complete the sentences:
1. They(can / might)____be away for the weekend but I'm not sure.
2. He(can / could)____be from Sheffield,judging by his accent.
3. They(can' t / may not)____still be out!
4. With luck,tomorrow(can / could)____be a cooler day.
5. You(can / might)____be right but I'm going back to check the information.

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