—It’s only ten minutes’ walk; I could have got there on foot.
— Yes. A taxi _______ not at all necessary.
| A．was | B．had been | C．has been | D．is |
__________ with a difficult situation, Arnold decided to ask his boss for advice.
| A．To face | B．Having faced |
| C．Faced | D．Facing |
The accident that happened at an oilfield __________ the southeast coast of the USA has caused great damage to the environment.
| A．away | B．from |
| C．off | D．beyond |
The project alongside with the experiment we had once devoted so much time __________ perfectly.
| A．to work out | B．to working out |
| C．to worked out | D．has worked out |
-Were you busy last week-end?
-Very. Rather than __________ time playing cards as usual, I devoted every effort to __________ an advertisement.
| A．waste; design | B．wasting; designing |
| C．to waste; design | D．a waste of; designing |
__________ to improve the students' sight, the eye exercises are done in schools nation-wide.
| A．Being designed | B．To design |
| C．Designing | D．Designed |