He didn’t make ________ clear when and where the meeting would be held. . 

—How long are you staying there?—_________depends.

．—When can we come to visit you?—Anytime you feel like________.

As the busiest woman in Norton,she made_________her duty to look after all the other people’s affairs in that town. 

I don’t think ____ possible to master a foreign language without much memory work.

．______was known to them all that William had broken his promise______ he would give each of them a gift.

If I can help_______, I don't like working late into the night.

--- How long will you be staying?  --- I don’t know. ________________.

．—Do you think_____     worthwhile to go all the way to Los Angles to buy that computer?—Well ,I’m going to visit some relatives, too.  

___ felt funny watching myself on TV. 

How long do you think ___________ the Microsoft brings out a new product?

He felt_______ to work for human rights and progress.

To save class time, our teacher has ________ students do half of the exercise in class and complete the other half for homework. .

Catherine bought a postcard of the place she was visiting, addressed______to _____and then posted it at the nearby post office．

The chairman thought________necessary to invite Professor Smith to speak at the meeting .

To know more about the British Museum, you can use the Internet to go to the library, or _______.

—There is still a copy of the book in the library. Wall you go and borrow ________? —No, I’d rather buy  ________  in the bookstore. 

I will never know what was on his mind at the time, nor will________.

Little joy can equal ________ of a surprising ending when you read stories.

—There is still a copy of the book in the library. Wall you go and bottow          ?—No, I’d rather buy         in the bookstore.