—Hey, man. You can’t cross the street now. You have to wait        the traffic lights turn green.
—Oh, sorry and thank you.

• A. when
• B. after
• C. until
• D. while

If we        take environmental problems seriously, the earth        worse and worse.

• A. don’t; will be
• B. won’t; isn’t
• C. won’t; is
• D. don’t; won’t be

       you don’t give up, your dreams will come true.

• A. As long as
• B. As soon as
• C. As well as
• D. As good as

My father was preparing for his speech         my mother was doing some washing last night.

• A. if
• B. while
• C. unless
• D. until

He’s not a perfect child. He sometimes talks back (回嘴；顶嘴)       his parents talk with him.

• A. if
• B. before
• C. when
• D. until

We can easily become unhappy       we work out our problems in our daily life.

• A. after
• B. if
• C. until
• D. unless

Your uncle will come to see you as soon as he        here.

• A. arrives
• B. arrived
• C. will arrive
• D. is arriving

—Alan! Why are you so late?
—Sorry! When I         home, I met one of my old friends.

• A. went
• B. am walking
• C. has gone
• D. was walking

Mr. Liu has taught English        he came here.

• A. since
• B. as
• C. when
• D. for

I told him the news          he came back yesterday.

• A. until
• B. as soon as
• C. unless
• D. if