1.When crossing the street,we _________ never be too careful.( )
A. | may | B. | should | C. | can | D. | must |
20.Please look at this picture taken around 20 years ago.I wonder if you can _______ my father.( )
A. | take out | B. | pick out | C. | look out | D. | speak out |
18.-Is this computer working well now?
-Yes.My mother _______ it repaired.( )
-Yes.My mother _______ it repaired.( )
A. | need have had | B. | can have had | C. | must have had | D. | should have had |
13.Busy as he is,he ______ a few hours for exercise every day.( )
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A. | sets off | B. | sets about | C. | sets down | D. | sets aside |