Let’s clean the classroom, _______?

—Shall I tell John about it? —No, you _____. I don’t know his telephone number.

Up to now there have been many explanations _______ the cause of sleepwalking.

What you said reminds me _______ something I read a few days ago.

She hasn’t decided with ______ she should first make contact.

Because of his degree, he refused to do ______ he thought “low” work.

That is ______ we differ.

Another worry is that telecommunication systems may isolate people ______ each other.

If I ______ in your place, I wouldn’t trouble him.

_______ the moon moves round the earth is well known to all of us.