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20.-Tomorrow is a holiday. Why are you doing your homework now?

    -I am doing these exercises so that I won’t have     tomorrow.

    A.to            B.it             C.them          D.for

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19.I like getting up early in summer. The morning air is good     .

    A.to be breathed    B.being breathed    C.to breathe       D.breathing

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18.Tell me     you want your coffee, black or white?

    A.how           B.when          C.which         D.what

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