我学生时代曾去背包旅行。

I went ___backpacking when I was a student.

直到现在我主要是在欧洲背包旅行度假。

Until now I mainly spent my holidays ___backpacking through Europe.

许多年轻人选择背包旅行，以低廉的预算探索新地方。

Many young people choose ___backpacking to explore new places on a budget.