Internet makes it (convenient) for us to get in touch with each other.
A. 缓慢地
B. 费力的
C. 便捷的
D. 昂贵的
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The solar cell can convert the energy of sunlight into (electric) energy.
A. 水力的
B. 电力的
C. 风力的
D. 核的
He is indifferent to the (result) of the exam.
A. 结果
B. 过程
C. 开始
D. 难度
A person's behavior is often (regulated) by his circumstances.
A. 打击
B. 鼓励
C. 偏离
D. 规范
he is writing a letter of (apology).
A. 10
B. 申请
C. 交换
D. 辞职
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