Mary plays light music _________ her free time to enjoy the beauty of music.
in
at
on
The room is big enough for us _________ .
That tennis ball is one of ___________.
She is short.So she sits________ the classroom.
Lin Shuhao,______ NBA star,will continue_______match this season. A an;the B.an;at C.a;the D.the;an
Frank is my pen pal, he _____________ Sydney, Australia.