根据句意、首字母或汉语提示，写出正确的单词。

1. My house is on a          (安静的)street.

2.There is a                    near my home. I can send my letters there.

3. How much do you _____ for the new shoes?  

4. A          are from the United States.

5.There is little time, so I         a taxi to the airport.

计算题：已知煤粉对焦炭的置换比为0.8，每小时下料批数7批，焦炭负荷为3.5，每小时若增加1t煤粉，则如何调整负荷。（1）若减焦炭则减多少？（2）若增加矿石则加多少？