Sometimes the boy is a bad-tempered child, but he ____ be quite lovely when he wishes．

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

—The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job?—________ my students have a try?

I ______ follow you. Would you please repeat it?

You should _____ some English every day. It’s good for your vocabulary.