16. The explanation of our teacher will help make the text easy _____.

　　A. to understand　　 　　　　　 B. to be understood　

　　 C. understood　　 　　　　　　 D. understanding

15. _____ dinner with us. We have got prepared for it.

　　 A. Do come and have　

　　 B. Do come and to have　

　　 C. Do to come and have

　　 D. Do to come and to have　

14. Some students prefer a strict teacher who tells them exactly what to do. Others prefer _____ to work on their own.

　　 A. having been left　　　　　 　B. to leave　

　　 C. to be left　　 　　　　　　 D. leaving

13. I have got a loaf of bread; now I’m looking for a knife _____.

　　 A. to cut it with　　　　　 　 B. to cut with it

　　 C. with it to cut　　　　　 　 D. it to cut with

12. From the dates _____ on the gold coin, we decided that it was made five hundred years ago.

　　 A. marking　　　 　　　　　　 　B. marked　　　

　　 C. to be marked　　　　　　 　 D. having been marked

11. Although the lecture had already been on for five minutes， I still was not able to find a chair _____.

　　 A. to be sitting　　　　　　 　B. sit on

　　 C. to sit on　 　　　　　　　 　D. for sitting

10. He is rather difficult to make friends with, but his friendship, _____, is more true than any other.

　　 A. once gained　 　　　　　　 　B. when to gain　

　　 C. after gaining　　　　　　　D. while gaining

9. It rained continuously for a week, completely _____ our holiday.

　 A. ruining　　　　B. to ruin　　　 　 C. ruined　　　 　　D. ruins

8. He let me repeat his instruction _____ sure that I understood what was _____ after he went away.

　 A. making; to do　　　　　　　 B. to make; to do　

　 C. making; doing　　　　　　 　D. to make; to be done

7. _____ what the situation would be like, they decided to keep silent.

　 A. Having not known　

　 B. Knowing not 　

　 C. Not know　　

　 D. Not knowing