As we all know．____life is hard for any of us. If we live___ happy life，we must all work harder.
| A．／：／ | B．／；a | C．a；／ | D．a；a |
—People often don't appreciate what they have, do they?
—No, _________ they lose it．
| A．if | B．after | C．until | D．when |
— Where were you last night? We had a wonderful party．
— Oh, ________ If you had called me, I wouldn’t have gone to the cinema．
| A．What a shame! | B．Who cares? |
| C．bad luck! | D．What a coincident! |
The white building, ______ threats to pull it down, is now a private house in the possession of a retired professor．
| A．having survived | B．surviving |
| C．to survive | D．survived |
Everyone doesn’t agree to the plan．Some support it while I’m one of ______ opposed to it．
| A．those who | B．who | C．those | D．that |
The two friends ______ on line for three hours, and they will go on．
| A．had been chatting | B．had chatted |
| C．were chatting | D．have been chatting |