The house, ____________is blue, will be used as a library.
He hesitated for a moment before kicking the ball, otherwise he a goal.
It was hard for him to learn English in a family, in which_____ of the parents spoke the language.
It was nine years ago, when I came to China for the first time ____ I began to learn Chinese.
If you really have to leave during class, you’d better leave____ the back door.
----Do you think it wise for Chinese mothers to try to do everything for their children? ----No, that’s they are mistaken.