QUES: acceptable (OPTIONS:
- unacceptable
- acceptable)
ANS: He can't have been working.

QUES: acceptable (OPTIONS:
- unacceptable
- acceptable)
ANS: I screamed at some children who were watching me.

QUES: acceptable (OPTIONS:
- unacceptable
- acceptable)
ANS: Who did you ask saw what?

QUES: acceptable (OPTIONS:
- unacceptable
- acceptable)
ANS:
He will put the chair between some table and some sofa.