Teenagers should be encouraged to go ______and be close to nature.
There aren’t _________ apples. Could you please buy __________?
My pen pal __________ Japan.
There is _____airport in Liaocheng. _______ airport is very large.
---Excuse me. Is the library open all day? ---. Only from 8 a.m. to 4 p.m.
You afraid of doing homework. You know, it’s easy. Just be careful.