Paper is ________ useful invention.It was invented around 2，000 years ago by Cai Lun.（ ）
A．aB．anC．/D．the
I was still feeling hungry I had eaten some sandwiches．（ ）
| A． |
so |
B． |
though |
C． |
since |
﹣﹣﹣Xining is geting more and more beautiful．
﹣﹣﹣Oh， yes， I think more changes are ．（ ）
| A． |
on the radio |
B． |
in the end |
C． |
on the way |
﹣﹣﹣Lily is intelligent and hard﹣working， she do well in the singing competition．
﹣﹣﹣Sure．She was born to be a singer．（ ）
A．shouldB．mightC．can't
﹣﹣﹣Could you please the picture on the wall and make it clean？
﹣﹣﹣Sure．I'd love to．（ ）
| A． |
pull down |
B． |
take away |
C． |
take down |
Cookies are just the thing to serve tall glasses of real lemon juice．（ ）
| A． |
at |
B． |
in |
C． |
with |