16-year-old students in England should understand fifteen _______ words.
--____are you staying in Ottawa?--About two weeks.
–Oh! There is a snake in front of Jay.--But it seems that he doesn’t ___the danger.
Uncle Wang didn’t stop to have lunch __he finished mending the TV set.
Our teacher said sound___much more slowly than light.
Will you please show me the way to the only tall building ___stands near the post office?