—I just went back from Guangzhou. Can you guess __________?
—I suppose you took the high-speed train（高铁）.
| A． |
how did I get there |
B． |
when I got there |
C． |
how I got there |
By the time I locked the door, I realized I ________ my keys at home.
| A．had repaired | B．had changed |
| C．had forgotten | D．had left |
It is cruel___ them to catch the sharks and cut______ their fins.
| A．of down | B．for off |
| C．of off | D．for down |
- Would you please take this workbook to the teacher's office for me?
— ________.
| A．Never mind. | B．With pleasure. |
| C．That's right. | D．Don't mention it |
I regret ______ to my head teacher,not listening to him.
| A．talk back | B．to talk back |
| C．talking back | D．talk with |
—The meeting _______ because of the fog in Northern China last week.
— Oh, it’s too bad! We should take action to improve the air quality.
| A．put out | B．was put out |
| C． put off | D．was put off. |