Answer:
Viajaba
Step-by-step explanation:
The Imperfect Tense is used to express actions that were done in the past, something that someone was doing in the past. The suffixes used in imperfect tense are aba, abas, ábamos, abais, aban, ía, ías, íamos, íais, ían.
Therefore, the correct imperfect tense conjugation in this statement is viajaba.
"Mi familia viajaba mucho a Europa"