用所给词的适当形式填空。
1. I used to _____ (live) in an apartment near Beihai Park.
2. Was Tom used to _____ (live) with his grandparents?
3. They became good friends when they met for the _____ (one) time.
4. In that school students have pretty _____ (relax) rules,
5. We never visit a friend's house without _____ (call) first.
