—How long has Jim been in the factory?
—He has been there for two years he left school.
| A．when | B．since |
| C．as soon as | D．while |
We all know trees play an important role in _______up the air.
| A．clean | B．cleaning |
| C．cleaned | D．Cleans |
Lucy and Lily are twins, but they are different _____each other in many ways.
| A．of | B．from | C．with | D．In |
It is necessary for students ______ good studying habits.
| A．to have | B．having |
| C．have | D．with having |
--I think people here are friendly. Do you _______me?
--Yes, you are right.
| A．play with | B．look at |
| C．agree with | D．laugh at |
Yangtze River is one of ______rivers in the world.
| A．big | B．bigger |
| C．biggest | D．the biggest |