Joanna is no less hardworking than her twin sister, _______ she failed in the final exam.
| A．but | B．so | C．or | D．and |
Plastic bags are provided for our convenience but they also have __________ the pollution of the environment.
| A．referred to |
| B．led to |
| C．reacted to |
| D．attended to |
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 |