By the time she reached the corner of the street, the footsteps _________.
| A．had gone | B．were gone | C．are missing | D．have disappeared |
There are no easy answers to questions brought to us by the rapidly changing world, we can try to turn challenges into opportunities．
| A．so | B．but | C．for | D．then |
If they what I was saying, they'd know what I was talking about
| A．took the trouble to listen to | B．had trouble listening to |
| C．take the trouble to listen to | D．have trouble listening to |
"I wish you’d look at me when I'm trying to speak to you!" the teacher said.
| A．excitedly | B．pleasantly | C．hopefully | D．angrily |
Mr．Smith gave the attendants a wonder lecturethe company in the international conference.
| A．on behalf'of | B．owing to |
| C．in the place of | D．standing for |
Please don't call me at the office it's really necessary．
| A．if | B．unless | C．otherwise | D．except |