What do the police think about the murder?— I’m not sure. But I want anyone who ______ the clue to contact the police actively.

We _________ for a picnic if it _________ rain this Sunday.

You should your teacher’s advice if you want to improve your science.— That sounds great.

There is someone knocking at the door.- It ______ be Jimmy, he has gone to ShangHai .

,the more quickly he will learn a foreign language.