Mr green () a good teacher.
A. has always been
B. has been always
C. always has been
I' m afraid he () find he key to this problem.
A. could never
B. never could
Couldn’ t never
() he knew it was just a joke,()Peter looked fightened.
Although ,but
B. /, and
C. Although,/
In order to communicate with foreigners,we () foreign language.
A. need to study
B. need studying
C. need study