.
Though the teacher had tried to make the problem easy__________, still Lily and her partner were at a loss.
| A．understood | B．understanding | C．to understand | D．to be understood |
Now I've got him in my __________；I can make him do anything I want.
| A．energy | B．strength |
| C．power | D．right |
The doctor thought __________ would be good for you to have a holiday.
| A．this | B．that |
| C．one | D．it |
The boy entered the room quietly in order to avoid __________ his parents.
| A．being waken up | B．to wake up |
| C．waking up | D．to have waken up |
Taking weight-loss pills will __________ our health.
| A．effect | B．affect |
| C．error | D．effort |
Does it ever __________ to you that they would be punished for being late?
| A．strike | B．occur |
| C．happen | D．appear |