2 Younad packed / packed your suitcase by the time I had arrived / arrived at your house. .
3 My parents didn't ride / hadn't ridden their bikes
for ages, so they had had / had a few problems!
4 We hadn't eaten / didn't eat candy floss before
we had visited / visited the theme park last
week.
5 He hadn't stayed / didn't stay in a hotel until he
went / had been to Blackpool.

2 You had packed (Past Perfect) your suitcase by the time I arrived (Past Simple) at your house.  

3 My parents hadn't ridden (Past Perfect) their bikes for ages, so they had (Past Simple) a few problems!

4 We hadn't eaten (Past Perfect) candy floss before we visited (Past Simple) the theme park last week.

5 He hadn't stayed (Past Perfect) in a hotel until he went (Past Simple) to Blackpool.