Tìm lỗi sai và sửa lại cho đúng: (body language) is quiet and (secret), but (most) powerful language (of all)

Tìm lỗi sai, nêu lý do và chữa lại cho đúng:
1. (body language) is quiet and (secret), but (most) powerful language (of all).
2. (stayed) (strong), family members (have) to (be engaged) in each other's lives.
3. (once) you can (overcome) your difficulty, the proplem (may well become) a source of (strengthen) to your marriage