13．When crossing the street，you should always________the traffic.
A．watch B．watch out
C．watch for D．watch out for
12．-You don’t look quite yourself today.What’s the matter?
-Well，I’m suffering from a cold.Nothing serious，________.
A．indeed B．anyway
C．though D．yet
11．Tyron was very angry，but coolheaded enough to________rushing into the boss’s office.
A．prevent B．avoid
C．protect D．allow
10．-Hi，Peter.Long time no see.
-Oh，it’s you，Jack.I’m sorry I didn’t ________you at first.
A．know B．recognize
C．remember D．realize
9．The murderer reached________his gun，and then shot at the man.
A．for B．out
C．in D．of
8．Do tell me the ways you think of________the problem as soon as possible.
A．to solve B．solving
C．solve D．being solved
7．The students entered the classroom，smiling and________，and________down to have their lessons.
A．talked；sat B．talking；sitting
C．talking；sat D．talked；sitting
6．________，most teenagers now listen to rock music.However，John likes classical music better.
A．In a word B．In general
C．In time D．In total
5．People are encouraged to speak openly，but careless words are________to hurt others’ feelings.
A．possible B．probable
C．likely D．sure
4．The________on his face told me that he wasn’t satisfied with my answer.
A．impression B．sight
C．appearance D．expression