We have two foreign teachers here. One is from England, and ______ is from America.

I believe _____ important to have a rest when you feel very tired. 

.---____ did you leave the classroom? ---____ I saw my daughter sit down and read her book. 

--- What’s wrong with my son, doctor? --- ____________ serious, just a slight cold. He’d better drink some water.

Eating _______ sweet food is not good for our health (健康).