In time of serious accidents，_____ we know some basic things about first aid,we can save lives.

A.whether     B.until　　 C.if       D.unless

I’ve tried very hard to improve my English. But_____ by no means with my progress.

A.the teacher is not satisfied

B.is the teacher not satisfied　

C.the teacher is satisfied

D.is the teacher satisfied

Everywhere man has cut down forests in order to grow_____ crops，or to use _____wood as fuel or as building material.

A.the;the    B.the;/　    C./；the     D./；/

Isn't it time you got down to the papers?

A.mark     B.be marked　　C.being marked    D.marking

-- Must he come to sign this paper himself?

-- Yes, he           .

A. need              B. must            C. may            D. will

I thought she was famous, but none of my friends have            heard of her.

A. even         B. ever          C. just           D. never

The traffic lights           green and I pulled away.

A. came           B. grew            C. got           D. went

I was still sleeping when the fire          , and then it spread quickly.

A. broke out       B. put out        C. came out         D. got out

Jenny was very sad over the loss of the photos she had shot at Canada,           this was a  memory she especially treasured.

A. as             B. if             C. when           D. where

Sarah had her washing machine repaired the day before yesterday,           she?

A. had           B. did             C. hadn't          D. didn't