(D)21.Jill is ________ 8yearold girl.She usually wears ________ uniform at school.
A.a;a B.a;an C.an;an D.an;a
(D)22.Mom doesn't want me to watch TV ________ school nights.
A.for B.at C.in D.on
(B)23.Please be ________!We are in the library.
A.noisy B.quiet C.sorry D.happy