单项选择题

Jack is a strong ______, but you could beat him if you perform at your highest level.

A. opponent
B. partner
C. friend
D. mate
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单项选择题
Be careful with those fireworks; they are ______ to go off unexpectedly.
A. available
B. presumably
C. easy
D. able
单项选择题
It seems very difficult ______.
A. to stop the child to cry
B. protecting the child from crying
C. to keep the child from crying
D. holding the child’s crying
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