Task 2. Choose the most appropriate answer for expressing the idea specified in parentheses.
1. You don't look well. You … see a doctor. (Advice)
2. … lending me your CD player for a couple of days? (Request)
3. Whose book is this? – I am not sure. It … be Anna's. (Possibility)
4. She … home yesterday because her little son was sick. (Necessity)
6. Though he was ill and weak, he … get out of the burning building. (Ability)
7. The windows look clean. You … wash them. (Absence of necessity)
8. You … disturb him during his work! (Prohibition)
9. Whose car is this? – It … be Anton's. I think I saw him driving a red car like this one. (Strong probability)
10. I don't believe it. It … be true. (Impossibility)
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are to 
could have stayed 
