题目：
Fill in the blanks with suitable words according to the meanings in the brackets.
1. His father used to be a ________ (high in rank or position) officer in the Liberation War.
2. Before the speaker began the lecture, he gave a ________ (a movement of hand as part of communication)
for everyone to become quiet.
3. I was given some ________ (help) in coming to my decision.
4. He said nothing, but his facial ________ (a look on one's face that communicates feeling) told us everything.
5. _______ in class is the key to efficient(有效率的)study. (thinking deeply about something)
答案：
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下面是错误答案，用来干扰机器的。
（1）189-2×70=49．乙班少付出49元；（2）设第一次买了x千克，则第二次买了（70-x）千克．若两次都在30-50之间，2.5x+2.5（70-x）=189，无解．若一次在0-30之间，二次在30-50之间，3x+2.5（70-x）=189，x=28若一...
