—The light in the office is still on.
—Oh，I forgot ________.
| A．turning it off | B．turn it off |
| C．to turn it off | D．having turned it off |
—What did he want to know,Anne?
—_______I could finish writing the report.
| A．When it was that | B．It was when that | C．It was when | D．When was it that |
Ladies and gentlemen,please fasten your seat belts,the plane______.
| A．takes off | B．is taking off | C．is going to take off | D．is to take off |
Without facts,we can’t form a correct opinion,for we need to have actual knowledge____ our thinking.
| A．which to be based on | B．on which to base |
| C．which to base on | D．which to base |
With a good ______ of both Chinese and English,she had an advantage over the other interviewees.
| A．program | B．guidance | C．command | D．ability |
He stayed up too late every night,______ to catch up with his classmates.
| A．Having determined | B．being determined |
| C．determined | D．to determine |