请认真阅读下面短文，并根据各题所给首字母的提示，写出一个合适的英语单词完整、正确的形式，使短文通顺。
       When you wave to a friend, you are using sign language. When you smile at someone, you mean to be  f____ . When you put one finger in front of your  m____  you mean “Be quiet.”
       Yet, people in different countries may use different sign languages. Once an Englishman was in Italy. He could speak little Italian. One day when he was walking in the street, he felt h____  and went into a restaurant. As the waiter came, the Englishman  o____  his mouth, put his fingers into it and took them out again and moved his lips (嘴唇). In this way, he meant to say, “ B____  me something to eat.” But the waiter gave him a lot of things to  d____ . First tea, then coffee, then milk, but no food. The Englishman was sorry that he wasn't a____  to tell the waiter what he wanted. He was just going to l____  the restaurant when another man came in and put his hands on his stomach. And this sign was clear e____  for the waiter. In a few minutes, the waiter brought him a large plate of bread and meat. At last the Englishman had his meal in the   s____  way.

游客乘坐过山车，在圆弧轨道最低点处的向心加速度是20m/s²，重力加速度g=10m/s²，那么此位置座椅对游客的作用力相当于游客重力的

仓库内有一批14米长的钢材，把它们割成3米长和5米长的各50根．如果不计损耗，最少要从仓库内取出多少钢材？

根据短文内容。选择适当的短语完成句子。    A man goes to a fast food restaurant for lunch. "Hi!" a waiter says. "Can I help you?"
    "I'd like a hamburger。French flies and a medium pizza, "says the man.
    "Anything else?'' the waiter asks.
    "No, "the man answers. "That's all. ''
    "Is that for here or taking away?" the waiter asks.
    "Taking away, "says the man.
    The man pays for his lunch. The waiter puts the man's lunch in a bag. 'The man takes the bag away.
    "Thank you!" the waiter says. "Have a nice day."
    The man walks to a park. He sits down and opens the bag. To his surprise(使他吃惊的是), there are no hamburgers in the bag. There are no French fries. There is no pizza. There is money(钱)in the bag a lot of money. The man counts the money--2, 000 dollars!
    Why is the money in the bag? The man doesn't know. Do you know? Can you guess?

A. to a park      B. a lot of money      C. the man's lunch in a bag D. "I'd like a hamburger, French fries and a medium pizza.'' E. to a fast food restaurant for lunch

下列各组含氯元素的物质中，氯元素化合价相同的一组是（　　）