16. - I must apologize for ____ ahead of time .

　　 - That‘s all right . (’94)

　　 A . letting you not know　　 B . not letting you know

　　 C . letting you know not　　 D . letting not you know

15. How about the two of us ____ a walk down the garden ? (’93)

　　 A . to take　　 B . take　　 C . taking　　 D . to be taking

14. I would appreciate ____ back this afternoon . (’92)

　　 A . you to call　 B . you call　 C . your calling　 D . you‘re calling

13. - I usually go there by train .

　　　 - Why not ____ by boat for a change ? (‘92)

　　 A . to try going　 B . trying to go　 C . to try and go　 D . try going

12. I can hardly imagine Peter ____ across the Atlantic Ocean in five days . (’91)

　　 A . sail　　 B . to sail　　 C . sailing　　 D . to have sailed

11. They would not allow him ____ across the enemy line . (‘87)

　　 A . to risk going　 B . risking to go　 C . for risk to go　 D . risk going

10. The squirrel was lucky that it just missed ____ . (’87)

　　 A . catching　　 B . to be caught　　 C . being caught　　 D . to catch

9. I can’t imagine ____ that with them . (‘96)

　　 A . do　　 B . to do　　 C . being done　　 D . doing

8. Only one of these books is ____ . (‘86)

　　 A . worth to read　　 B . worth being read

　　 C . worth of reading　　 D . worth reading

7. I really enjoy ____ that kind of job . (’85)

　　 A . do　　 B . doing　　 C . to do　　 D . to be doing