17. A lion only attacks a human being when it is hungry.

A. should B. can C. will D. shall

16. Would you open the window please ?　 Yes, I______.

A. will B. would C. do D. can

15. The teacher do all the exercises, but a pupil_______.

A. needn't....must B. may not...must　 C. needn't....needn't D. can't....must

14. ______I go back before lunch?　 No, I don't think you________.

o C. Must...have to D. May .... ought to

13. Tom was a diligent boy. He go to school though it was raining hard.

　was able to B. could C. couldn't D. wasn't able to

12. There was plenty of time. You_____.

A. mustn't hurry B. mustn't have hurried

C. needn't hurry D. needn't have hurried

11.The professor gave orders that the experiment before 5:30p.m.

A. be finished B. will finish

C. must be finished D. would be finished

10. I mailed the letter two weeks ago. She_____it.

A. must receive B. can't receive C. might receive D. must have received

9. If he started at 9 0'clock, he be there by now.

A. need B. shall C. ought to D. must

8. Man die without water.　　 A. will B. can C. need D. shall