I think ___ knowledge of the Internet is ____ must in our work today.
Chongqing doesn’t _____me.It is so hot that I can’t ______it indeed.
The CDs are on sale! Buy one and you get _____ completely free.
——Hi, Mike.Any idea where Mary is? ——She ____ in the classroom.I saw her there just now.
There’s no _____ from my bedroom window except fro some factory chimneys.
—Have you thought of the topic for the composition? — Not yet.I _____ it very carefully, but I haven’t decided.