1. Until/When he arrives, everyone must stand.
2. Please phone your dad by the time/immediately.
3. As soon as/ Before you hear the alarm, run for the exit.
4. Supposing/In case you had a baby girl — what would you call her?
5. We’re not going to stop digging until/ as soon as we find the ancient ruins.

1. When

2. immediately

3 As soon as

4 Supposing

5 until