—Do you mind if I open the window?
— ____________.
| A．Yes, please | B．No, but I do | C．No, go ahead | D．No, you’d better not |
--Must I turn off the gas after cooking?
--Of course. You can never be ________ careful with that.
| A．enough | B．too | C．so | D．very |
_____ it is you’ve found, you must give it back to the person it belongs to.
| A．That | B．Because | C．Whatever | D．However |
----- Can I help you?
----- I’d like to buy a present for my father’s birthday, ____ at a proper price, but of great value.
| A．which | B．that | C．one | D．any one |
He was very busy, and ______ he didn’t go to the party that night.
| A．however | B．therefore | C．otherwise | D．anyhow |
---Thank you so much for the wonderful party, Chris.
----You’re quite welcome, John. ____.We’ve been looking forward to seeing you.
| A．Just stay a little longer, please | B．It’s just of my pleasure. |
| C．Thank you for coming | D．I don’t think you had a good time |