—We're doing a lot to protect our environment, but it is not good enough. —So we should try______ to look after it.
Of all the subjects, chemistry seems to befor me.
Tony is a quiet student,he is active in class.
Whenever you have a chanceEnglish, you should take it.
We'd better waitmore minutes. I think Jeff will come soon,
_____ will be less pollution if we try our best to protect the environment.