Complete each of the following sentences so that it means the same as the first

Complete each of the following sentences so that it means the same as the first.
1. If we aren’t careful, that will happen easily.
Unless we………………………………………………………………………
2. There is the woman. She works in my father’s laboratory.
There is the woman…………………………………………………………..
3. Unless we have a map, we will get lost in that jungle.
If we……………………………………………………………………….
4. She is the teacher. Her son saved my brother’s life.
She is the teacher whose……………………………………………………..