Choose the correct variant in brackets and underline it. In three

Choose the correct variant in brackets and underline it. In three sentences two
variants are possible. There is example (0) at the beginning.
0) A sense of humour is a thing (that/which) is very important in a friend.
1) The time (which /that) friends spend together helps to form a lasting friendship.
2) Some people choose friends (who/ which) are much like themselves.
3) A person (who/-) does not like you just does not know you very well.
4) Friends are people (who/with whom) we share both good and bad times with.
5) Friendliness is a feeling (which/that) shows that one person has interest in another person.
6) All (that/-) we can do for our friends we must do.
7) Everything (which/-) we know about our friends we should not tell anyone else.
8) Our friendship is a feeling (of which/of that) Im sure.