Is this the reason at the meeting for his carelessness in his work? (2012．上海)
| A．he explained |
| B．who explained |
| C．how he explained |
| D．why he explained |
It is reported that the United States uses _____ energy as the whole Europe.
| A．as twice more | B．twice more as | C．twice much as | D．twice as much |
In peace, too，the Red Cross is expected to send help _____ there is human suffering.
| A．whoever | B．wherever | C．whatever | D．however |
Mr. Smith has bought a new house in the country, around _____ some green trees.
| A．which is | B．it is | C．which are | D．them are |
I'd like to have visited the Palace Museum last week, but something unexpected _____to my father.
| A．had happened | B．happened | C．has happened | D．happens |
—What are you busy with?
—The conference _____in our city next week, as you know.
| A．held | B．will be held | C．be holding | D．to be held |