某企业只生产一种产品，单价20元，单位变动成本12元，固定成本为2400元，满负荷运转下的正常销售量为400件。以下说法中，正确的有()。

I would just as soon you ______ the book yesterday.

A．had returned

B．returned

C．would have returned

D．would return

I will not lend the book to you ______ you can return it in time.

A．in case

B．so that

C．unless

D．if

A．which

B．as

C．what

I'm sorry that I forget ______ the book to you yesterday.

A．giving

B．to give

C．to be given

A．which

B．as

C．what

I have read the book, so you can ______it for a week.

A．keep

B．return

C．take

I'd rather you () the book to me now.

A、will return

B、should return

C、return

D、returned

A．get

B．remain

C．maintain

D．keep

A．get

B．remain

C．maintain

D．keep

I will lend you the book ________you return it to me in time

B.on condition that

C.in case

D.in order that

E.so that