A. was destroyed B. is destroyed C. were destroyed D. has been destroyed
A. making B. to make C. make D. makes
A. is B. has been C. are D. have been
A. knows B. know C. is known D. are known
A. is B. are C. was D. has been
A. need B. needs C. has a need D. have a need
A. involve B. involves C. involving D. to involve
A. become B. has become C. becomes D. is becoming
A. should be B. must be C. is D. are