—Shall we go for a drink at one o'clock this afternoon?
—________.Will two o'clock be OK?
| A．Sure，it's up to you |
| B．Sure，no problem |
| C．Sorry，I can't make it |
| D．Sorry，I'm not available today |
__________ the Internet is of great help, I don't think it's a good idea to spend too much time on it.
| A．If | B．While |
| C．Because | D．As |
I was working as a waiter last month，__________ my friends were lying on the beach.
| A．whenever | B．though |
| C．for | D．while |
-When did the computer crash?
-This morning, while I __________ the reading materials downloaded from some websites.
| A．have sorted | B．was sorting |
| C．am sorting | D．had sorted |
I was glad to meet Jenny again，__________ I didn't want to spend all day with her.
| A．but | B．and | C．so | D．or |
__________ he promised that he wouldn't be late, he didn't arrive until the end of the party.
| A．Since | B．Although |
| C．Because | D．Until |