D. for teaching

　　16. ______ the room, a letter was laid on the ground.

　　A. Entering

　　B. Having entered

　　C. He entered 

　　D. Mrs Green entering

　　17. They set out ______ for the ______ boy.

　　　A. searching; losing 

　　B. searching; lost  C. to search; lost D. to search; missed

　　18. ______ her mother had come, her face lit up.

　　A. Hearing B. Having heard

　　C. When hearing

　　D. When she heard

　　19. They arrived at their university very late, ______ the gate closely shut.

　　A. found

　　B. to find  

　　C. find

　　D. finding

　　20. ----Do you have anything more ______, sir?

　　----No. You can have a rest or do something else.

　　A. typing

　　B. to be typed   C. typed   D. to type

　　21. The manager promised to keep me ______ of how our business was going on.

　　A. to be informed

　　B. on informing C. informed

　　D. informing

　　22. With a lot of difficult problems ______, the manager felt worried all the time.

　　A. to settle

　　  B. settling   C. settled

　　D. being settled

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