Sarah是班长,老师走进教室准备上课,她应该这样说:A. Sit down.B. Good morning.C. Stand up.
_____does he watch TV? Once a week.
My sister is sick. I must look _____her.
There are too many old newspapers. _____throw them away.
Betty is _____artist. She never wears____ _ uniform.
We often _____hiking at the weekend.