Qingdao is a good place for summer vacation. My father ___________ there several times.
| A．has gone to | B．have gone | C．have been to | D．has been |
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
It took the students two hours to complete the test paper.
A. endB. make C. finish
My classmates are all friendly to me.
A. happyB. badC. kind