Chọn đáp án đúng

6. That is ________ book I’ve ever read. 
    A. the borest    B. the boring     C. the most boring     D. the most bored
7.  The opposite of "polluted " is ....................            
    A. fresh        B. good        C. dirty           D. safe
8. We should use reusable water bottles ___________ of plastic ones.                
   A. instead         B. because    C. despite        D. however
9. In the future, we won’t go on holiday to the beach but we ________ go on holiday to the moon. 
    A. must     B. can’t     C. might    D. won’t
10. ________ you swim when you were ten?
    A. Can     B. Could    C. Will    D. Might