Phrasal verbs and collocations

1.- I was cleaning my room when I came across my old favourite necklace.
2.- In case you're free this weekend you can come round and stay.
3.- We were watching TV when your accident came up on the documentary.
4.- Your friend came up with a good idea so we could solve the mystery.
5.- Susan wasn't doing the exercises in the group work so we came to the conclusion that she didn't understand the instructions.
6.- After planning his great birthday party everything came to nothing when his little sister told him about the surprise.
7.- When she was only 16 years old her pregnancy came as a complete surprise to her family.
8.- It came as a terrible shock when the boy had disappear from his house.