21. Children under six are not _____ to school except those of extraordinary intelligence.
A. permitting B. accepted C. admitted D. received
22. ---Who do you think is to blame for the boy’s behavior, Mary or her parents?
--- We all think it is Mary as well as her parents that ______ for their son’s bad performance at school.
A. are to blame B. is to be blamed C. are to be blamed D. is to blame
23. The singer is always very ______ to the reaction of the audience when she gives a performance.
A. sentimental B. positive C. sensible D. sensitive
