单项选择题
She（）mail the package before the post office closes.
A. has
B. have to
C. has to
D. must to
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The seller was trying to sign a substantial order（）
A. that is made with certain conditions.
B. that you have finalized the delivery dates.
C. then he could get a large discount.
D. to be more flexible over terms of payment. -
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They look forward to（）the new products soon.
A. saw
B. see
C. seeing
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The telephone line is（）busy at the moment.
A. fair
B. quite
C. well
D. quiet
