―He hardly has any friends to play with , _____ he?―_______! That’s why he feels lonely from time to time.
Stop ______ about the traffic. Just think about what we can do to improve it.
I can't connect my computer to the Interrnet. There must be ______ wrong with it.
Mr. Li asks the students ______ in the river, because it’s too dangerous.
interesting subjects they are !
To live a green life, we should try to save ____ energy and produce__pollution.