---Alice, why didn’t you come the other day ? .
---I______, but I had an unexpected visitor.
| A．had | B．would | C．was going | D．did |
—Is Bob still teaching?
—I’m afraid not. He is saidthe school as he has become a businessman.
| A．that he has left | B．to leave |
| C．to have left | D．to be left |
—I wonder how much you charge（要价） for your services.
—The first two are freethe third costs￥30.
| A．while | B．until | C．when | D．before |
The discovery of the stolen car led to.
| A．the thief having caught | B．the thief catching |
| C．the thief being caught | D．the thief to be caught |
is known to us all is that the 2012 Olympic Games will take place in London.
| A．It | B．What | C．As | D．Which |
—Is there any possibilityyou could pick me up at the airport?
—No problem.
| A．when | B．that | C．whether | D．what |