---Mr. Smith must know a lot about Chinese history.
---________. He has studied it for years.
| A．So he does | B．So does he | C．So he must | D．Yes, he must |
He smiled politely ______ Mary apologized for her drunken friends.
| A．as | B．if | C．unless | D．though |
— Sorry I’m late. I got stuck in traffic.
— _________. You’re here now. Come in and sit down.
| A．You are welcome | B．That’s right | C．I have no idea | D．Never mind |
I’ve _______ the habit of calling in on my grandparents on my way home from school.
| A．come into. | B．gone into. | C．got into. | D．run into. |
The Smith don’t usually like staying at ____ hotels, but last summer they spent a few days at a very nice hotel by _____ sea.
| A．/ ; a. | B．the ; the. | C．/ ; the. | D．the ; a |
We ______ the difficulty together, but why didn’t you tell me?
| A．should face | B．might face |
| C．could have faced | D．must have faced |