This math problem is too difficult. Can you show me________, George?
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A
what to work out
B
to work it out
C
how to work it out
D
how to work out it
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－ I’ve bought a box of chocolate for our daughter.－ Oh, how good a dad! But she doesn’t like sweet things. _______ know that?
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A
Do you
B
Don’t you
C
Won’t you
D
Didn’t you
— ______ does Tom surf the Internet ? —Twice a week .
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A
How much
B
How many
C
How long
D
How often
Must we find out the reason today? - No, you _____.
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A
mustn’t
B
don’t have
C
don’t have to
D
needn’t to