Nobody worked the math problem out． It was ____ one of all．（ ）
| A． |
easier |
B． |
the easiest |
| C． |
more difficult |
D． |
the most difficult |
I will be if I get good grades this time．（ ）
| A． |
excited |
B． |
exciting |
C． |
excite |
My parents have a lot of housework ．（ ）
| A． |
do |
B． |
to do |
C． |
doing |
You'd better your coat，it's very cold outside．（ ）
| A． |
wear |
B． |
put on |
C． |
dress |
Where's my ruler？I can't it anywhere．（ ）
| A． |
look for |
B． |
find out |
C． |
find |
Could I ask you some questions？
Yes，you ．（ ）
| A． |
can |
B． |
could |
C． |
must |