Why not open the window? It’s too in the room.

If we ______ take environmental problems seriously, the earth _______ worse and worse.

、This question is ______ easy, all the students can answer the question.

It’s almost eight years we _______ each other last time.

I `d like to go walking with you, ____________ I have so much homework to finish today. —That’s all right .Let’s go out for a walk ____________day