Many scientists believe that the universe began with an enormous explosion called the “Big Bang”, ______ happened about 13.7 billion years ago.
| A．that | B．which | C．when | D．what |
—He to the meeting. Have you informed him of it?
—Sorry. I to.
| A．hasn’t come; am going |
| B．didn’t come; have forgotten |
| C．hasn’t come; forgot |
| D．doesn’t come; will have |
He the person referred to be put in prison.
| A．said | B．demanded |
| C．agreed | D．thought |
at in this way, the present situation about birds flue doesn’t seem so disappointing.
| A．Looking | B．Looked |
| C．Having looked | D．To look |
, I think, and all the problems could be settled.
| A．If you make more efforts |
| B．Making more efforts |
| C．A bit more effort |
| D．To have made more efforts |
Lu Xun was ___________ medical student before he turned ___________ great writer.
| A．the; the | B．the; a | C．a; / | D．a; a |