We will be given a（n）__________ to ask questions at the end of the lecture.
| A．presentation | B．explanation |
| C．opportunity | D．possibility |
20. When Jack arrived, he learned Mary ____ for almost an hour.
| A．had gone | B．had set off | C．had left | D．had been away |
19. They didn't _____ the wedding because of a heavy rain.
| A．join | B．take part | C．attend | D．Appear |
18. Don't worry! He ____ no attempt to leave. He will stay here to help you.
| A．made | B．got | C．had | D．Tried |
17. --- Will someone go and get Mr. White?
--- He’s already been ____ .
| A．asked for | B．sent for | C．called for | D．looked for |
16. It is reported that they ____ arms and began to fight against the invaders (侵略者).
| A．took on | B．laid down | C．took up | D．Shoulder |