13. --May I put my luggage on the seat beside you, sir?
--__________.
| A．Sure, with pleasure | B．Oh, please yourself |
| C．Well, never mind | D．It’s my pleasure. |
I don’t think Mary is angry with you,________?
| A．do I | B．is she? | C．isn’t she | D．don’t I |
I suppose he ought to have known that,________?
| A．don’t I | B．oughtn’t he | C．do I | D．ought he |
You’d never heard of it before I told you,________?
| A．did you | B．didn’t you | C．would you | D．had you |
You all had a good time yesterday,________?
| A．hadn’t you | B．haven’t you | C．didn’t you | D．don’t you |
The Greens seldom go to the concert,________?
| A．don’t they | B．do they | C．don’t he | D．do he |