答案：
解析：
　　We are so happy to have Ms Green here together with us．Mary is a Canadian．During the period of 1990 to 1996 she studied at Chicago University in America studying English and Chinese．After graduation she began to work in a research office in England．In 1999 she came to China and since then she has　been teaching English in middle schools in our country．She will help us improve our English pronunciation and encourage us to speak English more．Besides she will let us know something about the middle school education in Canada and develop the friendship between Canada and China． 　　I hope Ms Green will have a good time and work happily．Now let's invite Ms Green to say a few words． 　　Thank you!

答案：
解析：
　　We are so happy to have Ms Green here together with us．Mary is a Canadian．During the period of 1990 to 1996 she studied at Chicago University in America studying English and Chinese．After graduation she began to work in a research office in England．In 1999 she came to China and since then she has　been teaching English in middle schools in our country．She will help us improve our English pronunciation and encourage us to speak English more．Besides she will let us know something about the middle school education in Canada and develop the friendship between Canada and China． 　　I hope Ms Green will have a good time and work happily．Now let's invite Ms Green to say a few words． 　　Thank you!