Passengers must not leave their seats ________ the plane comes to a full stop.

A. produce

B. produced

C. are produced

D. was produced

A. can

B. need

C. may

D. should

A. What

B. How

C. What a

D. How a

A. Thank you.

B. That’s fine.

C. Don’t worry.

D. I think it helps.

A. That’s all right.

B. That’s terrible.

C. I don’t think so.

D. I’m afraid not.

A. pleasant; pleased    B. pleased; pleased

C. pleasant; pleasant    D. pleased; pleasant

A. Don’t mention it    B. Never mind

C. Of course not    D. No problem

A. company    B. store

C. office    D. website