My bed is 1.2 meter tall（改错） Our room are 39 square meters.

My bed is 1.2 meter tall（改错）
--- My bed is 1.2 meters复数 tall.
Our room are 39 square meters.
--- Our room is单数 39 square meters (large).The ruler is 25 centimeters length.---The ruler is 25 centimeters long形容词.
It can dive in the deep cold water.---It can dive into the deep cold water.这题没把握!