The materials used have to be able to (withstand) high temperatures.
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Police have appealed for (witnesses) to the accident.
A. 保险费
B. 代替品
C. 目击者
D. 志愿者
A (lunar) cycle takes about a month to complete.
A. 放松的
B. 月球的
C. 持续的
D. 不变的
She refused to (submit) to threats.
A. 屈服
B. 改变
C. 传播
D. 抵制
These shoes are (durable).
A. 耐用的
B. 满足的
C. 单个的
D. 抵抗的