HSK 7-9
挨家挨户
āijiā-āihùto go from house to house
志愿者挨家挨户通知居民。
Zhì yuàn zhě āi jiā āi hù tōng zhī jū mín.
Volunteers went from house to house notifying residents.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.