单项选择题

A lot of birds are flying（）the south.

A. over
B. by
C. towards
D. with

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单项选择题
The world is（）seven continents and four oceans.

A. made up of
B. made out of
C. made from
D. made in
单项选择题
--You've made great progress in your studies of English, haven't you--Yes, but much（）

A. remains to do
B. is remained to do
C. remains to be done
D. is remained to be done
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