Some aspects of a pilot's job ________ be boring, and pilots often ________ work at inconvenient hours．

A．can; have to

B．may; can

C．have to; may

D．ought to; must

There's no light on－they ________ be at home．

A．can't

B．mustn't

C．needn't

D．shouldn't

We hope that as many people as possible ________ join us for the picnic tomorrow．

A．need

B．must

C．should

D．can

－Julia said she sent you a birthday card yesterday．Have you got it?

－Oh, really!I haven't ________ my mailbox yet．

A．examined

B．reviewed

C．tested

D．checked

－The cars give off a great deal of waste gas into streets．

－Yes．But I'm sure something will be done to ________ air pollution．

A．reduce

B．remove

C．collect

D．warn

Life is tough in the city．In order to lose their ________, some people drink alcohol．

A．temper

B．mood

C．consciousness

D．pressure

________ such heavy pollution already, it may now be too late to clean up the river．

A．Having suffered

B．Suffering

C．To suffer

D．Suffered

________ this cake, you'll need 2 eggs, 175 g sugar and 175 g flour．

A．Having made

B．Make

C．To make

D．Making

There's no beer left and the pubs are shut so you'll have to ________．

A．go out

B．go off

C．go without

D．go through

It was ________ a great deal of time, and the headmaster of my school gave me a choice：stay in school or leave to work on my magazine．

A．taking up

B．making up

C．picking up

D．keeping up