20.All these postcards must be mailed at once in time for the Spring Festival.( )
A. | to have received | B. | so as to be receiving | ||
C. | so as to be received | D. | to receive |
19.Another advantage is that it's so slim that it won't too much space in your bag.( )
A. | take up | B. | make up | C. | put up | D. | use up |
18.If you frequently headaches,your children may also have the same problem.( )
A. | suffer | B. | suffer for | C. | suffer through | D. | suffer from |
17.-Mr Wang,I have trouble _______ the text.
-Remember ________ it three times at least.( )
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-Remember ________ it three times at least.( )
A. | to understand,reading | B. | understanding,reading | ||
C. | understanding,to read | D. | to understand,to read |