用方框中短语的适当形式填空

1．Fresh air and exercise can ________ good health．

2．John studied hard before the examination, and it ________ －he got full marks for all subjects．

3．We had to ________ the whole plan, as things didn’t go as we had expected．

4．Can I be of any ________ you?

5．Before doing your exercises, you should ________ the text．

6．How can I ________ my work when you play that loud music?

7．________ a few fine days, the summer has been wet．

8．We have to prepare for the party ________．

9．________ I was about to fall down, he seized me by the hand．

10．Did the medicine ________ my headache?

11．You ________ stay at home and do your homework．

12．The invention of computers ________ our daily life．