It was nine years ago, when I came to China for the first time ____ I began to learn Chinese.

睡前你要对妈妈说_____________.

an’t concentrate on his lessons recently.—-Yes, that may ________ why he did so badly in the last test.

You_____tothemeetingthismorningifyouhavesomethingimportanttodo

ou show me the way to Gate B, Subway Line 2—Sorry, I am not a native in Chengdu. You can ask the volunteer over there.—_________.