When he saw a wallet on the ground, he ______ at once.
A. picked it up B. gave it up C. picked up it D. gave up it
难度: 中等查看答案及解析
Jim works hard at his Chinese, and ___________.
A.so Lucy does B.so is Lucy
C.so does Lucy D.so Lucy is
难度: 中等查看答案及解析
Parents often ask their kids their Internet friends because the kids may be in danger．
A. to meet B. not to meet C. meeting D. not meeting
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—Excuse me. Could you tell me ______ get to the nearest post office?
—Sorry, I am new here.
A.how can I B.how I could
C.how to D.what I can
难度: 中等查看答案及解析
________energy，turn off the hot water after you take a shower．
A.Save
B.Saving
C.Saved
D.To save
难度: 中等查看答案及解析