-------The weather is terrible now; our earth is badly damaged!
-------Yes. It’s urgent that everyone _________ spare no effort to do something to save our world .

--- Don’t you think it necessary that he __________ to Miami but to New York?
--- I agree, but the problem is _______ he has refused to.

A foreign language like English is difficult to learn, so you ____________ work too hard.

．— Why didn’t you tell me the truth that day?
— I _____, but you _____ for Fuzhou when I went to see you．

—Sorry，Mum, I lost my key to the bicycle again．
—Oh! How_____ you be so careless! You have to learn to look after your belongings．

― What sort of friend do you want to have? Someone beautiful?
― Well, it ____ be beautiful―that’s not important.

We ______ last night, but we went to the concert instead.

—Your boss looks rather a kind person.
—But in fact he is cold and hard on us. You ______ believe it!

.________ the warning message, more lives would have been lost in the flood.

. The school rules state that no child ______ be allowed out of the school, unless accompanied by an adult.
A will          B. must          C. shall         D. may