Надо выбрать правильный ответ but no one knows who first found the secret of making glass and no one knows when that 1)to 2)for 3)with

но она не знает кто впервые нашел тайну создания стакана и никто не знает когда что

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Reporter: jess, could you answer some questions about the anglo-russian exchange student?   jess: yeah, of course.  reporter: who are the families?   jess: all the russian students received family through their correspondence. we decided that before coming to london.  for example, we invited lena to stay with the family julia. martin invited dima to stay with my family. and my penfriend, kate lives with her family. stefan, my classmate, and his family threw a party for our guests on their place next weekend.  reporter: what are you going to show your russian friends during those two weeks?   jess: we have planned a lot of things for our guests and discussed our plans with our teacher barbara gray. we want to make their stay in london very interesting and unforgettable experience.  reporter: what places have you already visited?   jess: we were at trafalgar square, london eye, tower of london and the science museum. you can ask them about it if you want. they say they enjoyed the tours.  reporter: thank you very much. i plan to ask them lots of questions tomorrow morning. i hope they will share their experiences.