1. The departure time of the plane has been postponed, so we have nothing to do now but .

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

　　2. Only when we came back home, that my watch was missing.

　　A. did I find B. I found

　　C. I had found D. Had I found

　　3. more time, the scientists will be able to work out a good solution to the problem.

　　A. Given B. Giving C. To give D. Be given

　　4. in Beijing for more than twenty years, he knows the city very well.

　　A. Living B. Lived C. Having lived D. To live

　　5.We plan to increase the output of the machine 7.4 percent this year.

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