在向压缩机加注冷冻机油时，可通过抽真空的方式加注,其加注量可随意。（）
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What should a teacher do if he barks like a dog according to Bradley?
A. He should turn into another type of job.
B. He should focus on the same career.
What do we know from this conversation?
A. Bradley is going to interview some principals.
Bradley gets the chance for some interviews.
Why was Bradley's relationship with his dad complicated?
A. Because he used up his dad's patience.
Because he made some mistakes in school.
What does Norman want his children to do?
A. To relieve their mom of the housework burden.
B. To help their mom out when emergency happens.
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