–Look! The man at the gate ____ be our headmaster. He is always standing there every morning.
-- No, it _____ be him. He is holding a meeting in the office now.
| A．must; can’t | B．must; mustn’t |
| C．can’t; can’t | D．can’t; mustnit |
You ________ play with the knife. You ________hurt yourself.
| A．mustn’t; may | B．mustn’t; must |
| C．shouldn’t; must | D．can’t; should |
— __________ is the price of the trip? — Ten dollars per person.
| A．How much | B．How many | C．What | D．How |
Could you please speak a little more ？ I can't follow you.
| A．quietly | B．slowly | C．loudly | D．quickly |
Her mother looked _________at that moment when she heard the good news.
| A．happy | B．happily | C．unhappy | D．unhappily |
With the help of his classmates, he ___________the difficult maths problems easily.
| A．gave out | B．acted out |
| C．put out | D．worked out |