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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单项选择题

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.

单项选择题

They look forward to（）the new products soon.

A. saw
B. see
C. seeing
D. to see

单项选择题

The telephone line is（）busy at the moment.

A. fair
B. quite
C. well
D. quiet