题目内容：

1:We should try to s______ water and electricity.
2:As we know,Bingxin wrote a letter to her little r______.
3:The children ______ (be) at home yesterday.
4:It's time _______ (play) sports now.
一定要说明理由啊

优质解答

save：节约
reader：读者
were：are的过去式
to play:It's time to do sth.意思是：到了该干某事的时间了.