i often help my mother to clean my younger brother's room so that it won't get too dirty

i often help my mother to clean my younger brother's room—— ——it —— too dirty

改为同义句

in case
gets

often改usually

I often help my mother to clean my younger brother's rome to keep it not too dirty

every time is这题目很难

我的答案是自己想的 可能有点牵强

in case gets