заполните пропуски who, which либо that1. this is a letter from

Заполните пропуски who, which или that
1. this is a letter from a freind lives in Glasgow.
2. this is a lertter from a company sells computes
3. the boy is only fourteen is going to be an excellent athere
4. When are you going to look through the mail came this morning?
5. i can't find the telephone bill was here a few minutes ago!
6. we must catch the train leavs at exactly ten