Which of the following sentences is correct？（ ）
| A． |
He came in and sat down． |
| B． |
We all like＜Harry Potter＞． |
| C． |
When we met．He didn't say hello． |
| D． |
We went out，headed for the bus stop． |
—Mum, could I watch the movie The Battle at Changjin Lake tonight?
—Of course, if your homework ______.
| A． |
finishes. |
B． |
finished |
C． |
was finished |
D． |
is finished |
—What’s your dream, Lingling?
—I’m going to be ______ excellent teacher like Zhang Guimei.
| A． |
a |
B． |
an |
C． |
the |
D． |
/ |
—Please mind your head, sir.
—________
| A． |
It doesn’t matter. |
B． |
OK! Thank you. |
C． |
Don’t mention. |
D． |
I’m afraid not. |
Making robots is one of ________ activities among students. Each of them has his own robot.
| A． |
more popular |
B． |
the most popular |
C． |
more difficult |
D． |
the most difficult |
Many people have lost their homes because of wars. It’s important for people ________ a peaceful world.
| A． |
have |
B． |
had |
C． |
to have |
D． |
to be having |