The boy and the girl_____ with each other at first sight and they_____ in lovefor 5 years.[ ]

There is ____ “l” and ____ “u” in the word “luck”.

The air pollution is terrible.—It will be worse _______ we take action to protect the environment.

Nothing is so easy as ________ parents to raise their expectations of their children too high(2012·福建，33)

Excuse me, what’s your phone number— .