The left-behind kids (留守儿童) can’t see their parents         the parents come back home from work.

The question is         that nobody can answer it.

根据提示填空（每空一词）
She will do some cleaning as soon as she ____ (finish) her homework.

根据提示填空（每空一词）
据我所知，他下周将会回来。
As far ____ I____, he will be back next week.

根据提示填空（每空一词）
Lucy was sleeping while Mary ____ ____ (read) a magazine.

—Can you guess if they        speaking English with us?
—I think they will do if they        free.

—We will certainly enter a good high school         we work hard.
—Yes. Our dream will come true by working hard.

—Mr. Li        to Mary carefully when I entered the classroom this morning.
—He is very patient        he is young.

根据提示填空（每空一词）
他自从去年来到这儿就教英语。
He ____ ____ English since he ____ here last year.

Three years         since I         you last time.