I don't remember___________ to the airport that year.
| A．to be taken | B．being taken | C．having | D．to take |
I hate going out alone, so I often ask my friend to __________ me.
| A．defend | B．protect |
| C．accompany | D．guard |
In spite of all the efforts __________ these endangered species, many of them have died out over the years.
| A．to protect | B．protecting |
| C．protected | D．having protected |
After the explosion, the roads are full of __________ people leaving the city.
| A．afraid | B．frightened |
| C．frightening | D．scary |
The news was, and there was a __________ look on her face.
| A．shocking; frightening | B．shocked; frightened |
| C．shocking; frightened | D．shocked; frightening |
The strike may hold __________ production of cars for several months，__________ a great loss.
| A．out; cause | B．up; causing |
| C．out; causing | D．up; cause |