A. usefulB. fullC. easyD. coreIn those early days, the ……

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

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

单项选择题The computerized doll（）the quality test.

A. passed
B. succeeded
C. made
D. got