被动语态句是英语中常见的一种语言现象，尤其是在科技英语中。
Passive voice sentences are common in English language, especially in scientific English.
应该充分利用每分钟的时间来练习讲英语。该句为被动语态。
Every minute should be made use of to practice speaking English.
[解析]新机器在使用之前要先做测试，根据句意，这里应该用被动语态。
The new machine ought to (test) ______ before it is put to use.
[解析]新机器在使用之前要先做测试，根据句意，这里应该用被动语态。
The new machine ought to (test) ______ before it is put to use.
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