He wondered if he could slip out of the lecture hall without anyone
| A．noticing | B．noticed | C．to notice | D．being noticed |
The children were warned of not being too_________about things they are not supposed to know.
| A．strange | B．amusing | C．curious | D．satisfied |
--- I regret ________ you that John has been fired.
--- I can hardly believe my ears. He is such a fine worker.
| A．telling | B．having told | C．to tell | D．to have told |
This is the first time we ________ a film in the cinema together as a family.
| A．see | B．had seen | C．saw | D．have seen |
Tom was about to close the window ________ his attention was caught by a bird.
| A．when | B．if | C．and | D．till |
Not until he left his home ______ to know how important the family was for him.
| A．did he begin | B．had he began |
| C．he began | D．he had begun |