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.

Mr. Liu has taught English        he came here.

I told him the news          he came back yesterday.

Usually, we don’t know how important something is        we lose it.

Don’t forget to wash your hands        you have meals.

—Would you like to go for a walk with me, Alan?
—I’d love to,        you don’t want to go alone.

—What shall we do now?
—       it’s raining hard, let’s stay at home.

We should eat many fruits         apples and oranges.

They didn’t go to bed        they finished their homework.