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Answer:
1. There's a door which lead to a secret passage at the end of the hall.
2.She's friend with the two children whose their mother is the headmistress.
3. Same works in Switzerland that are not in the European Union.
4. While on holiday I met a lot of people, some of which were really boring.

1. There is a door leading to a secret passage at the end of the hall.

2. She is friendly with two children whose their mother is the headmistress.
(She is friendly, with two children and being the headmistress.)

3. Same works in Switzerland that is not in the European Union.
(Some works in Switzerland could not join the European Union.)
(Some works in Switzerland is not the same in European Union.)

4. While on holiday I met a lots of people, some of which were really boring.
On holiday, I met (a lot of )/(lots of) people whose really boring.

2007-03-27 10:39:55 補充：
4. While on holiday I met a lots of people, some of which were really boring ( While on holiday, I met a lots of people and some of them were really boring)