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

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

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

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

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

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

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

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

Mr. Liu has taught English        he came here.

I told him the news          he came back yesterday.