What’re you going to doto protect the environment — Plant trees on sideof the river.

We’d better stay here a little longerhe turns up unexpectedly

We will play football _________Class 4 tomorrow. — Good luck.

How did your mathematicsexam go—I thought I ，but in fact I fell behind in the class

We’ve spent too much money recently.—Well，it isn’t surprising. Our friends and relatives ______ around all the time.