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模具的费用主要包括哪些部分,模具价格处理的方法有哪些?

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— Why did you miss the interview yesterday?— Terribly sorry. My pet dog got seriously injured and I ________ it all the day.

A. attend
B. was attending
C. had attended
D. have attended

Albert Einstein was born in 1879. As a child, few people guessed that he ________ a famous scientist whose theories would change the world.

A. has been
B. had been
C. was going to be
D. was

He must have sensed that I ________ him. He suddenly glanced at me and said quietly, "Why are you staring at me like that?"

A. would look at
B. looked at
C. was looking at
D. am looking at

两样本平均数进行比较时，分别取以下检验水平，以（）所对应的犯第二类错误的概率最小。

A. 0.20
B. 0.10
C. 0.05
D. 0.01