However, at times this balance in nature is ______, resulting in a number of unforeseen effects.
| A．troubled | B．disturbed | C．confused | D．Puzzled |
The difficulty we now meet with is ___________ we can persuade him to tell the truth.
| A．whether | B．that | C．what | D．why |
. A party was given in the hall _______ the guests from France.
| A．in favor of | B．in need of | C．in search of | D．in honor of |
After they ________ each other for a while, a violent quarrel finally ________.
| A．glared at; broke out | B．stared at; broke down | C．glared at; broke in | D．stared at; broke up |
Choosing the right dictionary depends on ______ you want to use it for.
| A．what | B．why | C．how | D．whether |
I ________ have been more than six years old when the accident happened.
| A．shouldn’t | B．couldn’t | C．mustn’t | D．needn’t |