All of us must do_______ to help protect the environment，or we will have more hazy weather雾霾天气.
| A．something useful | B．anything useful | C．useful something | D．useful nothing |
The Greens ____________ in China since 2008.
| A．has lived | B．have lived |
| C．lived | D．lives |
I saw a street cleaner __________ the street when I went to school this morning.
| A．clean | B．cleaning |
| C．to clean | D．to cleaning |
Planes are _________ than trains and buses.
| A．more quickly | B．fast | C．quickly | D．faster |
My father drives sick people to the hospital, because he is a/ an _______.
| A．teacher | B．doctor |
| C．ambulance driver | D．fireman |
My new classmate, John is a boy from ____.
| A．Indian | B．American |
| C．Canadian | D．Britain |