№1 Choose the best options to fill in the gaps in the text: 
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. 

Помогите пожалуйста с этими заданиями,буду очень благодарен!
                        

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