－Do you know Earth Day－Sure, it _______ in 1970 to tell us to protect our earth.

It is impolite toleavethe meeting finishes.

People have views on the policy published recently. Not everybody is in favor of it.

members of a team perform better,the trainer first of all has to know their ______________ and weaknesses.

My son, ___________ exercise every day. It’s good for your health.—OK.