51._______ from the outer space， our earth looks like a water-covered ball.

　　A. Having seen B. Seeing C. Seen D. Having been seen

　　52.I don‘t mind _______ the decision as long as it is not too late.

　　A. you to delay making B. your delaying making C. your delaying to make D. you delay to make

　　53.The picture _______ on the wall is painted by my nephew.

　　A. having hung B. hanging C. hangs D. being hung

　　54._______ such heavy pollution already， it may now be too late to clean up the river.

　　A. Having suffered B. Suffering C. To suffer D. Suffered

　　55.They pretended to be working hard all night with their lights _______.

　　A. burn B. burnt C. burning D. to burn

　　56.“Well， I‘ll tell you a secret ……” said the boy， with his mouth almost _______ my ear.

　　A. touched B. touching C. touch D. to touch

　　57.I don‘t feel like _______ anything now.

　　A. to eat B. eating C. having eaten D. to be eating

　　58.Since he left the university， he _______ in an accounting company.

　　A. has been working B. had worked C. had been working D. was working

　　59.By the time the tour ends， the football team _______ twenty matches in four countries.

　　A. will play B. will be playing C. will have played D. will have been playing

　　60.People who can neither hear ______ speak talk to each other with the help of their fingers.

　　A. or B. nor C. but D. and

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