I often think of the days _____ I stayed with the experts, _____ has a great effect on my job.
| A． when , which | B． when, who | C． that, which | D． which, that |
So suddenly __________ that people had no time to escape.
| A．did the big fire happen |
| B．the big fire happened |
| C．was the big fire happened |
| D．the big fire was happened |
I happened __________ with him when he was hit by a stone.
| A．I was talking |
| B．talking |
| C．to talk |
| D．to be talking |
You'd better not phone me between two and six o'clock this afternoon; I __________ a speech then.
| A．will give |
| B．will have been giving |
| C．will be giving |
| D．will have given |
By the middle of the 21st century, the vast majority of the world's population __________ in cities rather than in the country.
| A．are living |
| B．will be living |
| C．have lived |
| D．will have lived |
-I will call on you at 9:00 tomorrow morning.
-Sorry, I __________ the flight to Sanya then.
| A．have enjoyed |
| B．will be enjoying |
| C．am enjoying |
| D．am to enjoy |