The girl was working hard. She hoped to finish cleaning the house _____ her mother came back home.
| A．before |
| B．till |
| C．after |
| D．since |
I'm very tired ________walking for two hours.
| A．of |
| B．to |
| C．from |
| D．by |
It is Tu Youyou ________was presented the 2011 Lasker Clinical Medical Research Award on September 12.
| A．what |
| B．that |
| C．when |
| D．which |
We can ________a note of what the teacher says in class and ________notes afterwards.
| A．take；make |
| B．compare；take |
| C．make；compare |
| D．make；take |
All the employees of this department were ________into groups to discuss the question.
| A．cut up |
| B．brought up |
| C．split up |
| D．teamed up |
The disc，digitally ________in the studio，sounded fantastic at the party that night.
| A．recorded |
| B．recording |
| C．to be recorded |
| D．having recorded |