(Renewable) sources of energy must be used.
A. 可丢弃的
B. 可再生的
C. 可循环的
D. 可观察的
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You have to (persevere) with difficult students.
A. 偏激
B. 故意
C. 坚持
D. 无私
A family break allows you to spend (precious) time together.
A. 极限的
B. 宝贵的
C. 有趣的
D. 隐私的
The desire to advance of a youth is an ( ) of great value.
A. locate
B. donate
C. register
D. asset
We've now created the (outbound) service.
A. 进入的
B. 外出的
C. 收费的
D. 检查的
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