—There ______ be anybody in the classroom, for the lights are off.—I’ll go and check.
At the meeting he didn’t _______ well, so everyone was in a puzzle about his idea.
- Doing it like this means _______ time. -I didn’t mean ______ it.
The mountain wind _____ as much as three inches of snow overnight.
The news on ___ air reminded him of ____ old friend who is now in America.
With real estate (房地产)______ in economy, a lot of rich farmland had to ______ new houses and offices in the county.