The old lady’s hand shook frequently. She explained to her doctor ____this shaking had begun half a year before, and ____, only because of this, she had been forced to give up her job.
| A．when; how | B．how; when | C．how; how | D．why; why |
The book is not _____ what we paid.
| A．worth | B．valuable | C．cost | D．dear |
The thief ran away at the _____ of a policeman.
| A．sight | B．screen | C．sound | D．seeing |
There are usually at least two _____ of looking.
| A．means | B．ways | C．directions | D．courses |
My sister cleans the house from _____ to bottom when she is expecting visitors.
| A．roof | B．ground | C．floor | D．top |
Facing danger, he always _____ calm.
| A．seems | B．remains | C．becomes | D．appears |