【题目】Billy spoke in such a low voice that _________ in my office could hear him.

【题目】WeChat is _________ useful tool to communicate with others nowadays.

【题目】One function of federal government is to coin money. Which of the following is correct for the underlined word in the sentence?

【题目】We don’t know the love of our parents ____________ we become parents ourselves one day.

【题目】The TV play is about a true story ___________ happened in Lijiang in 1998.

【题目】— Why are you so excited today?

【题目】I don’t think Tik Tok（抖音）_____________ children, because there are some bad videos in it.

【题目】—Have you seen ___________ movie Amazing China?

【题目】—What did he say?

【题目】---You never feel worried before an exam, do you?