1£®£­Shall I look after your house while you are away?

£­______.

A.       It couldn't be better.     B. Of course you can.   C. If you like.        D. It's up to you.

2£®Every possible means _________ to prevent the spread of disease.

A. have tried                 B. have been tried                C. has tried            D. has been tried

3£®Only when the final examination is coming ___________ he had quite a lot to do.

A. he realized        B. he had realized   C. did he realize     D. had he realized