The song is about a couple forced to separate _________, but they valued the memories of their love all their lives.
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.
Everyone must ___ their notebooks on the desk while taking an English exam.