1 . ______ no attention to the difference between the two, I am sure, will be one of the worst mistakes you make.

A．Pay

B．Paying

C．Paid

D．Having paid

2 . _________, the student insisted that he should be separated from his roommates, who were noisy.

A．To avoid being affected	B．To avoid to be affected
C．Avoiding being affected	D．Avoiding to be affected

3 . I’d appreciate _________ if you would like to teach me how to use the expression once more and I always appreciate _________ me with my English in the past.

A．that; you to help	B．this; your helping
C．it; you to help	D．it; your helping

4 . Shortly after suffering from a massive earthquake and ________ to ruins, the city took on a new look.

A．reducing

B．reduced

C．being reduced

D．having reduced

5 . Please excuse me _______ your letter by mistake.

A．to open	B．to have opened
C．for opening	D．in opening

6 . The discovery of new evidence led to ________.

A．the thief having caught	B．catch the thief
C．the thief being caught	D．the thief to be caught

7 . ________ your own needs and styles of communication is as important as learning to convey your affection and emotions.

A．Understanding	B．To be understood
C．Being understood	D．Having understood

8 . If the car won’t start, _____ it.

A．try push	B．try pushing
C．to try pushing	D．to try to push

9 . I had as much fun sailing the seas as I now do _with students.

A．working	B．work
C．to work	D．worked

10 . He’s decided to devote himself 　　　 　a book.

A．to write	B．to writing
C．writing	D．in writing