I haven't got anything to do, so I__________go with you.
A. must
B. may as well
C. have to
D. may
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28.It's hot today. The temperature__________to 35℃.
A. has risen
B. has been risen
C. has been raised
D. has raised
29.__________turn green in spring.
A. Leaf
B. Leafs
C. Leave
D. Leaves
30.About__________of the workers in that steelworks are young people.
A. third fifths
B. three fives
C. three fifths
D. three fifth
31.Is the Changjiang River__________river in the world?
A. the third longest
B. the third longer
C. the three longest
D. the three longer
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