I’m sorry to have kept you ________ for a long time.
A. wait b. to wait c. waiting D. to be waiting
---Sorry, madam, you can’t get on the train. This is _____ old ticket.
---Oh! It’s out of _____ date.
| A．an; / | B．an; the |
| C．the; / | D．the; the |
The _____look on Sam’s face suggested that there must have been something _____ on his way to school.
| A．frightened; frightened | B．frightening; frightening |
| C．frightened; frightening | D．frightening; frightened |
Walking is a good way to keep fit. _______, swimming is helpful for your health.
| A．Correctly | B．Completely |
| C．Similarly | D．Definitely |
The president spoke at the business meeting for nearly an hour without _____ his notes.
| A．bringing up | B．referring to |
| C．looking for | D．trying on |
Seeing the ______ of children playing together on the beach, I felt so happy.
| A．scene | B．scenery |
| C．sight | D．view |