根据句子意思及汉语提示，写出所缺的单词。

Dear Toby,

     It’s a      1_   （好的) Saturday morning.I’m writing a letter to you.I find a new job as an English teacher in Japan. In Japan,the three most popular ways of      2_    ( 到达)to school are bus,train and subways. The students made much noise       3_   ( 直到) the teacher came into the classroom.They have dreams. Some want to be actors or players,others want to be      4_    ( 艺术家).I think Mark is the best student in my class. Young      5_    ( 虽然) he is, he is quiote experienced. He does morning      6_    ( 运动) every day. His mother is one of the     _7_  ( 富有的)woman.What about you? Did you      8_    ( 旅行) the United Kingdom? I can’t hear it clearly.Please speak      9 _   ( 大声).Oh,It’s raining outside. So I have to      10_    ( 带来)umbrella.

                                                                                                                                                  Yours,

                                                                                                                                                  Crystal

下列各组物质中都属于纯净物的是______

A．福尔马林、水、醋酸

B．盐酸、二氧化碳、胆矾

C．明矾、四氧化三铁、碱式碳酸铜

D．苯、汽油、酒精