Mariel drank her milk before going to bed.
"Essay on MY best teacher" We do not know your teachers and you did not provide any valid information on them, nobody can help without more data and you should be doing this alone because we dont know them.
Both are correct. Example sentences below.
In three hours, we will arrive at our house.
In three more hours, we will arrive at our house.
When using "more", it implies that there was time that was previously passed.
