以下关于氮气定压方式说法错误的是（)。A．定压式氮气定压系统中设有低压氮气罐和高压氮气罐B．当系

A．A. No, you can’t. They are two days overdu

B．B. You can, but you will need to officially renew it for one week.

C．C. The book is much in deman

D．D. You’ll have to pay fines.

If you ______ (wait)a little longer, you would have met him yesterday．

A．A. That’s impossibl

B．B. Can I keep it a little longer？

C．C. It doesn’t matter at all.

D．D. Thanks. I only need it for a few days.

—Can’t you stay a little longer？

—It’s getting late. I really _____go now， My daughter is home alone.

A .may

B .can

C . must

D .dare

You may keep the book () you like.

A、as well as

B、as long as

C、as soon as

D、as far as

You may borrow this book __________ you promise to give it back.

A、so long

B、as long as

C、as long

D、long as

You may borrow the book, ______ that you do not lend it to anyone else.

A．on occasion

B．on condition

C．on purpose

D．only if

ll come near to you and say, "Can I help you？" You needn't buy anything you don't want. You may try to find out __22__ the book you want is. But if you fail, the assistant will lead you there and then he will go away. It seems that he is not interested in selling any book at all.

There is a story which tells us about a good shop. A medical student __23__ a very useful book in the shop, but it was too expensive for him to buy. He couldn't get it from the library, either. So every afternoon, he went there to read __24__ at a time. One day, however, he couldn't find the book from its usual place and was leaving when he saw an assistant signing to him. To his surprise, the assistant pointed to the book __25__, "I put it there so as not to be sold out," said the assistant. Then he left the student to go on with his reading.

21)、

A.found

B.in a corner

C.where

D.good

E.a little

22)、

A.found

B.in a corner

C.where

D.good

E.a little

23)、

A.found

B.in a corner

C.where

D.good

E.a little

24)、

A.found

B.in a corner

C.where

D.good

E.a little

25)、

A.found

B.in a corner

C.where

D.good

E.a little

You may borrow the book,_____________ that you do not lend it to anyone else.

[A] on occasion

[B] on condition

[C] on purpose

[D] only if