Phrasal verbs with come

1. I was waiting in the bus stop When I came across a dear partner of school.

2. In this week I don`t work and I would like that some friends can come round and dinner with me.

3. My brother was very bad. He was bad-tempered, but since he came down with measles he changed.

4. I come up with an idea!! I want to make a big celebration for my parents.
Tomorrow, they will be thirthy eight years married.