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John does important research _______ the best ways to help the old.
#48571
A
finds
B
finds
C
found
D
to find out
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People living in cold climates prefer to use  warm clours   a warm and comfortable feeling there.
#50262
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to create
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to creating
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creates
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－Would you mind ____ here? －Sorry, I won’t.
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smoke
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Do you prefer _______?
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skate
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It is important for us ________English well.
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to learn
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We must practice_____Chinese every day.
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speak
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speaking
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speaks
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to speak