As soon as we went ________, our ship left port.

A. above board　　　 B.across the board　　　 C.on board　　　 D.by the board.

The pilot asked all the passengers on board to remain ___ as the plane was making a landing.

A. seat 　 　　　　 B. seating  　　 C. seated  　 　 D. to be seating

—Why does Sara know so much about Angkor Wat?

—She ______ have been there, or…

A. must　　 B. ought to　　 C. can　　 D. may

Great changes have taken place in that school. It’s no longer ________ it was 20 years ago,

________ it was so poorly equipped.

A. what; when　　 　　 B. what; which　　 　 C. which; what　 　 D. which; that

___________, but he still can’t understand it．

A．Having been told many times B．Although he has been told many times

C．He has been told many times D．Told many times

1.    I’ve included some ______ will help you picture the places I talk about.

A. photos / which B. photos / about which　 C. photos / which D. photo / for which

My work _______, I went home .

　　A. had been done        B. done        C. having done        D. to be done

John _____ knowledge of radio just by staying around the radio station.

　 A. caught on　 B. worked up　 C. took up　 D. picked up

New technology ____ to make sure that the cars, taxis, buses and trains we use ____ the air.

A. is used ; not to pollute B. has used ; is mot polluted

C. is being used ; do not pollute　 D. has been used ; to pollute