—I looked for you in the office, but I could’t find you. —Oh, I in the library
________of the chemical factories in their city _________pouring waste water into the river. It’s too dangerous.
—How much will you be paid? —Tom, I do it not for money, but for experience. ____, it’s a kind of volunteer activity.
It’s _______ MP5 . It can be used to listen music and watch movies . It’s ________ useful invention .
—The dictionary is an important _______ for students .Each of us must have one . —I think so .
—Excuse me, is there a post office near here? — _______ I can’t hear clearly.