我把眼镜放在这个硬壳盒子里以防压坏。

I keep my glasses in this hard ___case to prevent them from being crushed.

他把相机放在一个防震保护盒里。

He put his camera in a shockproof ___case for protection.

我把护照和机票都放在这个旅行包里。

I put my passport and plane ticket in this travel ___case.