23. — You can't finish the book in less than an hour, I suppose?
—_____________.
| A．Yes, I'm sure I can | B．No, hardly | C．Sorry, I can't | D．I don't think I can |
He is very busy. I don’t know if he _____ or not tomorrow.
| A．come | B．comes |
| C．will come | D．is coming |
“What place is it？” “Haven’t you found out we _____ back where we ______？”
| A．were, had been | B．have been, are |
| C．are, were | D．are, had been |
He has changed a lot. He _______ not what he _______.
| A．is, is | B．was, was |
| C．is, was | D．was, is |
Mr Smith ______ a book about China last year but I don’t know whether he has finished it.
| A．has written | B．wrote |
| C．had written | D．was writing |
“It’s twelve o’clock, I think I must be off now.” “Oh, really？ I ______ it at all.”
| A．don’t realize | B．haven’t realized |
| C．didn’t realize | D．hadn’t realized |