20.--The last one pays the meal.

　 --Agreed!

A. to arrive　 　　　　　　　　　 B. arrives 　　　　　　　　 C. arrived　　　　　　　　 D. arriving

19. Believe it or not, in the United States, 40% of the toys _____ are for adults.

　A. sold　　　　　　　　　　　　　 B. selling 　　　　　　　　　　 C. to sell 　　　　　　　　　　　 D. to be selling

18. We had an anxious couple of weeks _____ for the results of the experiment.

A. wait　 　　　　　　　　　　　　 B. to be waiting　　　　　　 C. waited　 　　　　　　　　　 D. waiting

17. When he came back three hours later , they were still sitting on the sofa , _______________ in conversation.

A. absorbing　 　　　　　　　　 B. absorbed　 　　　　　　　　 C. to absorb　　　　　　　　　 D. to be absorbed

16. It will take us about an hour to get to the airport, _______ possible traffic delay.

　 A. allowed for　　　　　　　 B. allowing 　　　　　　　　　 C. allowed 　　　　　　　　　 D. allowing for

15. At the sight of the policeman, ___from behind the door.

A. did the boy rush out　 　 B. did he sit down

C. out rushed the boy 　　　 D. rushing out was the boy

14. Unless _____ to speak, you should remain silent at the conference.

A. having invited　　　　　 B. inviting 　　　　　　　　 C. being invited　　　　　　　　 D. invited

13. Sometimes she was dying____________ her husband about it.

A. tell　 　　　　　　　　　　　 B. telling 　　　　　　　　　　 C. to tell　　　　　　　　　　　 D. of telling

12. __________ from above, the 2008 Olympic stadium in Beijing looks just like a bird’s nest made of the branches.

A. To see　 　　　　　　　　　　　 B. Seeing 　　　　　　　　　　　　　 C. Seen 　　　　　　　　 D. Having seen