We can have ___ bluer sky if we create ___ less polluted world.
| A．a. a | B．a, the | C．the, a | D．the, the |
As we’re students，we________obey the school rules．
| A．can |
| B．may |
| C．must |
| D．could |
All the students are talking and laughing in the classroom and it’s________．
| A．noisy |
| B．lonely |
| C．quiet |
| D．strict |
—I hear you are not allowed to eat in class．
—Right．It’s one of the________in our school．
| A．plans |
| B．orders |
| C．rules |
| D．suggestions |
Lin Shuhao is one of the best basketball________in the NBA．
A．actors
B．players
C．waiters
D．writers
I like reading English，________I don’t like writing．
| A．or |
| B．so |
| C．and |
| D．but |