Hepromisedtohelpmeandthen.A．ba

He promised to help me and then_________.

A．back out

B．backed out

C．backed of

D．backed on

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A．didn’t

B．shouldn’t

C．weren’t

D．don’t

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—She ______ them away. They must be somewhere.

A．can; can’t have thrown	B．must; needn’t
C．must; must have thrown	D．can; must throw

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—They _______the bus.

A．can have missed	B．must be late for
C．may have missed	D．might be late for

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—Sorry, I’m not sure. He __________ got up. Please go and see for yourself.

A．must have

B．can’t have

C．would have

D．might have

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－You must say sorry to Mary, Jack.
－Why ________ I say sorry to her? It’s her who hurt me first.

A．should

B．would

C．could

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