______ a volunteer is great.– I think so. Some of us want ______ volunteers for the next Olympics.

You may use the room as you like,______ you clean it up afterwards.

s Tom is, exercise has always been ______ hiswork

I can’t decide __________or not I should encourage my son to be a volunteer.— Why not It will make him more helpful.

Chinese astronauts can also walk in space now.– Yes, they’re______ our nation.