Excuse me, sir. Is the swimming poolopen all day—.Only from 6:00 pm to 10:00 pm.

Hellen set a good example ________ other mothers in demanding that children ________ enough time for sleep and play

Be quick! Or（否则） you’ll ________ the start of the film.

下列选项中，说法不正确的一项是（ ）

I didn’t go to bed _______ my sistercame back.