Paper is ________ useful invention.It was invented around 2,000 years ago by Cai Lun.( )
A.aB.anC./D.the
There's little ________ left at home.Go and buy some,dear.( )
carrots
potatoes
rice
How long can I keep this dictionary?
Two weeks.You must ________ it on time.( )
collect
call
return
The 31 stOlympic Games will take place ________ August,2016.( )
in
on
at
﹣Excuse me.Where is ________ school library?﹣This way,please.( )
an
the
a
Nancy and Kate are good friends.________ are both from England.( )
We
You
They