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 |
.
____ at the airport, he telephoned his wife and told her what he would do when he got home.
| A．Once arrived | B．As soon as he reached | C．When he got | D．Upon arriving |
.
—Have you finished the work?
—Not yet. I _______ to do it just a moment ago.
| A．set off | B．set up | C．set out | D．set down |
.
______ is known to everybody, the moon travels round the earth every month.
| A．It | B．That | C．As | D．Why |
.
When you are driving on this road, you have to limit your speed _____ 60 miles per hour.
| A．in | B．at | C．to | D．below |
.
—What do you mean. There are only ten tickets?
—There ______ be twelve.
| A．should | B．would | C．will | D．shall |