When I was walking in the street yesterday，I saw a UFO________over my head．
| A．flying |
| B．flies |
| C．flew |
| D．to fly |
Many books________about“the art of giving”；you can buy one for yourself．
| A．write |
| B．have been written |
| C．are writing |
| D．will write |
The clothes are aimed________teenagers．
| A．to |
| B．in |
| C．about |
| D．at |
Remember________your host’s suggestions and________the rules．
| A．to follow；obey |
| B．following；obeying |
| C．to keep；to keep |
| D．obey；follow |
Pandas are________animals in the world．We must do something to protect them．
| A．endangered |
| B．danger |
| C．dangerous |
| D．in danger |