_____, in some countries, people can play tricks on each other before noon on April 1 but they’ll be foolish if they do it in the afternoon.

Being afraid of making mistakes, the little boy _____ answer his teacher’s question. [ ]

You may search on the Internet for professors and their courses about the university ________ you may study for four years.

May I listen to the music here, Mr. White —-Sorry, you’d better ____ it like that..

When shall we go to the Xuanwu Lake Park， this Saturday or Sunday—________ is OK. I’m free on the weekend.