.We need to strike a ______ between the needs of the country and the rights of the individual(个人). 

The government has announced that a modern city will be set up in ____is still a wasteland now .

He called at every door, urging that people ________his products.

The classroom is big enough        , but we’ll have to move if we have more students. 

With a lot of difficult problems ______, the newly-elected president is having a hard time.