If you meet trouble, you can ______ your friends ________ help.
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.