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
We had an anxious couple of weeks _____ for the results of the experiment.
A. wait B. to be waiting C. waited D. waiting
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
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
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
Unless _____ to speak, you should remain silent at the conference.
A. having invited B. inviting C. being invited D. invited
