When you are _______ about which button to press on the complicated machine, you

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When you are _______ about which button to press on the complicated machine, you can either read the user"s guide for guidance or fax us for specific instruction. Don"t ______ the trial-and-error method. [ ]

A. insure; do
B. ensure; make
C. uncertain; try
D. unsure; touch

答案

举一反三

Experiment after experiment, they tried to acquire the _____evidence and ______ data needed to solve the technical problem. [ ]

A. concise; accurate
B. precise; concise
C. adequate; accurate
D. enough; concrete

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短文改错。            I felt sadly yesterday when our teacher told us something about
Project Hope in class. It has set up to help the children in the countryside
who can"t pay to go to school. After school I came home. I was wondering
if I could do something for the Project then
I caught sight of money-collecting box on the table.
Then I made up my minds to send my pocket money which
I had saved for nearly one year for the children
who wanted to go to school. I wrote a letter to
him and hurried to the post office. Together with the letter I posted the money
and sent with my best wishes to them.1._____
2._____
3._____
4._____
5._____
6._____
7._____
8._____
9._____
10._____

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The police were _______ what the boy had confessed because _______ he couldn’t have committed the crime all by himself. [ ]

A. doubtful about; as he was strong
B. in doubt of; strong though he was
C. curious about; though he was young
D. skeptical of; young as he was

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The work of professional sectaries is so ______ that few people like to apply for it; it demands of not      only high working efficiency bust also ______ available all the time. As a result, they are ______ great    demand.      [     ]
A. demanding; being; in
B. demanded; being; in
C. demanding; be; in
D. tiring; being; of

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You should have felt ______yourself for not helping the boy who was struggling desperately for life in the water.    [     ]
A. shameful of
B. shame with
C. ashamed of
D. shamed with

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