Is this the reason at the meeting for his carelessness in his work?
| A．he explained | B．what he explained |
| C．how he explained | D．why he explained |
The transformation of our city will make _______ for people here to have a comfortable environment.
| A．it possible | B．no possibility | C．impossible | D．there was possibility |
Mary _______ her mother with the housework, but she didn’t.
| A．must have helped | B．ought to have helped |
| C．must help | D．should help |
The local government announced that only when the fire was under control ________ to return to their homes.
| A．the residents would be allowed | B．had the residents been allowed |
| C．would the residents be allowed | D．the residents had been allowed |
He left home without saying a word, and _______ worries many people and is to be found out.
| A．where he has gone | B．where did he go |
| C．which place has he gone | D．where has he gone |
He came all the way to China for learning it better _______ for making money.
| A．other than | B．more than | C．better than | D．rather than |