Answer:
1. had gone; would have learned
2. had gone; would have become
3. had become; could/would have recorded
4. had gone; wouldn't have woken
Step-by-step explanation:
Third conditional statements are used to express the past consequences of an unrealistic action or situation in the past. The first action for example in the last sentence "If they had gone to bed early" did not happen. But in case, if it happened, then the second action would have taken place.