By the time he realizes he ____into a trap, it’ll be too late for him to do anything about it.

A. walks     B. walked     C. has walked    D. had walked

We ____ last night, but we went to the concert instead.

A must have studied      B might study

C should have studied       D would study

If you listen to me, you ____have some candies, Tommy.

A. are able to       B. shall       C. must       D. need

I wanted to catch __________ early train, but couldn’t get __________ ride to the station.

A. an, the     B. 不填, the     C. an, 不填    D. the, a

She raised her finger to her lips as _____ for silence.

A. an idea       B. a mark

C. a sign      D. a word

With the weather getting colder, visitors from Australia spent their _____ days in

　　　　Beijing.

　　A. a few last　　　 B. last few 　　　C. few last 　　　D. last a few

There is a mountain_____the top is always covered with snow. ?

A. whos      B. of which? C. itsD. that ?

He feels that his health ____ owing to ____ a long walk every other day.

　　A. is improving; taking　　　　　B. has been improved; being taken

　　C. improved; taken 　　　　　　　D. is improving; have taken

The most important thing about cotton in history is _____ part that it played in _____ Industrial Revolution.

 A．不填；不填  B．the；不填   C． the; the   D．a(chǎn); the

— Did you happen to see _______ black and _______ white cat?

    — Are they missing? I told you to take care of them.

    A. a; 不填     B. the; 不填     C. the; the    D. a; the