单项选择题

______ pollution control measures tend to be money consuming, many industries hesitate to adopt them.

A. Although
B. However
C. When
D. Because
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单项选择题
My grandfather had always taken a ______ interest in my work, and I had an equal admiration for the stories of his time.
A. splendid
B. weighty
C. vague
D. keen
单项选择题
Several major criminals ______ from the guards and escaped from the jail.
A. broke through
B. broke out
C. broke up
D. broke away
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