While he TV in the sitting room, the bell .
| A．watches, rings | B．is watching, rang |
| C．was watching, rang | D．watched, was ringing |
When the bell rings, we all go to the classroom to have class.
A.stops working
B.makes a sound
C.cries for help
I would like to be your penfriend.
A.wantB.like C.hate
Many factories poured out dirty water and polluted the Pearl River.
A. made ... clean
B. made ... full
C. made ... dirty
Timmy is good at designing 3D computer games.
A. does well in
B. learns about
C. Enjoys
They enjoy themselves at school every day.
A. are not happy
B. have a good time
C. are busy