Either the boy or his sister must have dinner here.
| A．his | B．her | C．their | D．theirs |
—Will you stay for lunch?
—Sorry, _______.My brother is coming to see me.
| A．I mustn't | B．I can't | C．I needn't | D．I won't |
Johnny, you _______play with the knife, you _______hurt yourself.
| A．won't; can't | B．mustn't; may |
| C．shouldn't; must | D．can't; shouldn't |
I should have been there, but I _______ not find the time.
| A．would | B．could | C．might | D．should |
—Are you coming to Jeff's party？
—I'm not sure． I _______ go to the concert instead.
| A．must | B．would | C．should | D．might |
Mr. Bush is on time for everything. How _______ it be that he was late for the opening ceremony？
| A．can | B．should | C．may | D．must |