单项选择题

Although they plant trees in this area every year, the tops of some hills are still

A. blank
B. hollow
C. vacant
D. bare
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John ______ from social activity because he felt embarrassed with people.
A. held on
B. held back
C. held off
D. held out
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Some people believe that giving gifts is one way ______ by others.
A. to love
B. love
C. to be loved
D. is loved
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