label to each of thetrees, with detailed introduction of their features, and visitors will knowmore about them and how to protect them.

My meaning didn’t ___so I explained it a second time.

_____ lie in the sun for too long, _______ you will get sunburnt

The door opened and ________, the victim of a traffic accident.

Now lots of teenagers spend a lot of time playing computer games. — Yes. Teachers and their parents should prevent them ___________ too much.