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The maths problem can be______.
  A.easy worked out        B. easy to be worked out
  C.easily worked out      D.easily to work out

 ___ many times, the boy still didn’t know how to do the exercises
　　A. Having taught           B. Having been taught　　C. taught    D. Teaching

 This page needed ___ again.
　　A. being checked          B. checked　　C. to check         D. to be checked

 The squirrel was lucky that it just missed ___.
A. catching           B. to be caught　　C. being caught     D. to catch

 --- What do you think of the book?　　---Oh, excellent. It’s worth ___ a second time.
　　A. to read      B. to be read        C. reading      D. being read

 The computers on the table ___ Professor Smith.
　　A. belongs     B. are belonged to　　C. belongs to    D. belong to

 Nobody noticed the thief slip into the house because the lights happened to ___.
　　A. be put up          B. give in        C. be turned on     D. go out

Take care! Don’t drop the ink on your shirt, for it __ easily.

A. won’t wash out B. won’t be washed out C. isn’t washed out D. isn’t washing out

 I have no more letters ____ ，thank you．
    A. to type        B. typing        C. to be typed       D. typed

 It is difficult for a foreigner ____ Chinese．
　　A. write B. to write       C. to be written    D. written