Choose the correct option

1. I heard a strange noise
   [when|that] I entered the room.
2. Try to make a lot of friends
   [when|while] you're at at school.
3. [As soon as|While] Jimmy saw a red jacket, he realised it was his.
4. I had never tried skateboarding
   [until|before] that day in Mexico City.
5. He found me working in the garden
   [and|or] he asked for help with some homework.
6. I was terribly late
   [that|because] nobody told me we had an extra lesson in the morning.