This river is too wide for the swimmers _________. 
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A
to swim
B
to swim across
C
to swim in
D
swimming
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The city in Shandong has become famous__________kites.
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A
to making
B
for making
C
make
D
makes
____ up late at night is bad for your health.
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A
Stay
B
Staying
C
stays
D
Stayed
My pen pal Andrew found it difficult ______ Chinese well
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A
learning
B
learn
C
to learn
D
learned