Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom.
| A．why | B．that |
| C．when | D．ours |
The __________ as one travels by boat along the Changjiang Three Gorges is fantastic.
| A．scene |
| B．view |
| C．scenery |
| D．sight |
They have to set a（n）__________ to the expense of the trip given that little money they have.
| A．edge |
| B．border |
| C．regulation |
| D．limit |
Sit down, Emma. You will only make yourself more tired，__________ on your feet.
| A．to keep |
| B．keeping |
| C．having kept |
| D．to have kept |
No one is permitted __________ the room until the chairman declares the end of the conference.
| A．leave |
| B．to leave |
| C．leaving |
| D．left |
Our English teacher raised her voice to make herself __________.
| A．hear |
| B．to hear |
| C．heard |
| D．hearing |