The Biology problem is too hard，so students can work it out．（ ）
| A． |
little |
B． |
few |
C． |
a little |
D． |
a few |
Work hard，______ you will get good grades．（ ）
| A． |
or |
B． |
but |
C． |
and |
Many more people have realized saving______ earth begins with small things．（ ）
| A． |
a |
B． |
an |
C． |
the |
Look! Miss Wang is carrying a heavy box． Let's go to help ．
My little brother likes to jump up and like a monkey．
Climbers is an exciting movie． I'm going to it．