-Must I use both hands?-Yes, you _____.

-I walk such a long way on such a hot day .-Oh, dear ! You____ be tired and thirsty.  Sit down and have a drink.

—     you play the piano at this time of the day ? I need a good rest for tomorrow’s test. — Sorry.  

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

You ___ drink wine before driving, or the police will take your license away.