The safe is impossible to break into.

[John]

Are these all OK?

1-1. Breaking into the safe is impossible.
1-2. It is impossible to break into the safe.
1-3. The safe is impossible to break into.

2-1. Living in such a house is too expensive.
2-2. It is too expensive to live in such a house.
2-3. Such a house is too expensive to live in.

3-1. Taking/Eating lots of vegetables is healthy.
3-2. It is healthy to take/eat lots of vegetables
3-3. Lots of vegetables is healthy to take/eat.

Thanks.

[Rusty]

Are these all OK?

1-1. Breaking into the safe is impossible.
1-2. It is impossible to break into the safe.
1-3. The safe is impossible to break into.

2-1. Living in such a house is too expensive.
2-2. It is too expensive to live in such a house.
2-3. Such a house is too expensive to live in.

3-1. Taking/Eating lots of vegetables is healthy.
3-2. It is healthy to take/eat lots of vegetables
3-3. Lots of vegetables is healthy to take/eat.

Thanks.

1-1. Breaking into the safe is impossible. OK
1-2. It is impossible to break into the safe. OK
1-3. The safe is impossible to break into. OK

2-1. Living in such a house is too expensive. OK
2-2. It is too expensive to live in such a house. OK
2-3. Such a house is too expensive to live in. OK

3-1. <strike>Taking/</strike> Eating lots of vegetables is healthy.
3-2. It is healthy to <strike>take/</strike> eat lots of vegetables
3-3. Lots of vegetables are healthy to <strike>take/</strike> eat. (This sounds unnatural. There is an ambiguity. Are the vegetables healthy, or is eating them healthy?)