30. Even if you are an experienced teacher, you sometimes ____ make some mistakes.
| A．can | B．must | C．should | D．Will |
—Do you know Ann Watterson very well?
—Yes, she used to be ______ coach and in ______ charge of our school team.
| A．a; the | B．the; the |
| C．a; 不填 | D．不填; 不填 |
—May I ask you something about the accident?
—Sure. ___________!
| A．You’re welcome | B．Go ahead |
| C．It’s up to you | D．It’s your turn |
Seeing the _____ dog, the little boy stood there with a _____ expression on his face.
| A．frightening; frightened | B．frightening; frightening |
| C．frightened; frightening | D．frightened; frightened |
Almost _______ of the students in this class wear glasses, that is, _______ of them.
| A．two thirds; 60 percent | B．two thirds; 60 percents |
| C．two third; 60 percent | D．two third; 60 percents |
Thewe recycle, the we waste.
| A．more; more | B．more; less |
| C．many; many | D．much; little |