—Do you practice how to escape from dangers every term?—Of course. Our school pays much attention to the ______ of safety.
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A
development
B
importance
C
advertisement
D
difference
推荐题目
They said they would have ____________ holiday.
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A
two months
B
a two-month
C
two-months
D
two-month’s
—___________ do you sleep every day? —More than 8 hours. 
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A
How often
B
How long
C
How much
D
How many
 —______will Mr. Green be back ?  —In a week, I think .
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A
How often
B
How many
C
How soon
D
How long
 I had a hard time learning math last year. 
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A
was hard-working
B
worked hard
C
had trouble
D
didn’t like