By the time the teacher came, we ______ cleaning the classroom．（ ）
| A． |
finished |
| B． |
have finished |
| C． |
had finished |
Volunteering our time to help people_______ a good way to learn new things.（ ）
| A． |
am |
B． |
is |
C． |
are |
The movie named A Little Red Flower shows ______ love for their children.（ ）
| A． |
parents |
B． |
parent's |
C． |
parents' |
﹣﹣﹣"Jerry，can you play tennis？"
﹣﹣﹣"Yes，I can.It's____ easy ball game."（ ）
| A． |
a |
B． |
an |
C． |
the |
﹣﹣﹣Sorry to cut in on you and Frank.
﹣﹣﹣_______ We're having a free talk.（ ）
| A． |
Never mind. |
B． |
Go ahead. |
| C． |
I hope so. |
D． |
That would be nice. |
We won't believe it ________ we see it with our own eyes.（ ）
| A． |
because |
B． |
unless |
C． |
if |
D． |
after |