We should consider what use can _____ the books.

There ______ a book, two pens and three pencils on the desk.

The doctor warns Tom smoking because it is bad for his health.

Don’t eat too much candy, for it’s_____ your teeth.—Oh,I get it.Thank you.

Can I pay the bill by check?—Sorry, sir. But it is the management rule of our hotel that payment _______ be made in cash.