单项选择题

Before we install a new heating system we should be sure we cannot make ______use of the one we already have.

A. efficiently
B. efficiency
C. efficient
D. more efficiently
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单项选择题
Our customer service team found your comments______and would like you to fill out a more detailed evaluation form.
A. confirmed
B. expectant
C. useful
D. interested
单项选择题
As the professor has pointed out in her lecture, a successful application letter should demonstrate the job-seeker's qualifications______and accurately.
A. eventual
B. lively
C. hopeful
D. clearly
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