The 2010 Expo will take place in Shanghai, ________ many countries consider a good chance to introduce their cultures to the world.
| A．where | B．when | C．what | D．which |
He left home in 1980 and has never come back ____.
| A．though | B．while | C．when | D．since |
— How about a game of chess?
— ____
| A．I agree. | B．Why not? | C．I’d like to. | D．That’s right. |
— Don’t forget to take the message to my teacher.
— ____.
| A．Yes, I will | B．No, I won’t |
| C．I don’t think so | D．Sorry, I wouldn’t |
— How many students are going to the Great Wall?
— ____.
| A．None | B．No one | C．No | D．Not any |
— Shall I help you with the washing ?
— No, Mary. I can manage, but ____.
| A．it doesn’t matter | B．I don’t mind |
| C．thank you just the same | D．it’s my pleasure |