Excuse me, Sir. But smoking is not allowed here.—Sorry, I didn’t see the sign. I’ll _______ my cigarette at once.

Shenzhen is a beautiful city. — Yes. You can see a lot of flowers and trees on ________ of the streets .

David, turn off the TV _____ no one is watching it.—But it _____ off already! The music is from the radio.[ ]

______ you ever ________ Tom before ?—- No, I _____ him just two minutes ago.

What’s wrong?—I can’t do my homework now. Imy homework in the classroom this morning.