QUES: acceptable (OPTIONS:
- unacceptable
- acceptable)
ANS: These plants may grow as high as 6 feet.

QUES: acceptable (OPTIONS:
- unacceptable
- acceptable)
ANS: The car has been being driven.

QUES: acceptable (OPTIONS:
- unacceptable
- acceptable)
ANS: The knife which he threw into the sea had a gold handle.

QUES: unacceptable (OPTIONS:
- unacceptable
- acceptable)
ANS:
I read some book.