I don"t know _____ I should buy a present. [ ]A. what B. if C. whichD. as

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I don"t know _____ I should buy a present. [ ]
A. what
B. if
C. which
D. as

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举一反三

We"ll go to visit Tian" an men Square _____ it doesn"t rain tomorrow. [ ]
A. if
B. as soon as
C. when
D. since

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—Would you like to go to the park with me, Susan?
—I"d like to, _____ you don"t want to go alone. [ ]
A. until
B. before
C. if
D. after

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Susan will not arrive at the airport on time _____ she hurries up.[ ]
A. once
B. if
C. when
D. unless

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Tomorrow we"ll go to the city park _____ it is sunny. [ ]
A. as soon as
B. when
C. if
D. as

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Don"t open the door _____ it is so cold. [ ]
A. because
B. because of
C. since
D. as

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