Oh! Mum. I hardly tell it is a butterfly on the leaf . Yeah. Some animals ______the color of their surroundings to protect themselves.

Seeing the happy scene, a lot of sweet memories ________.[ ]

You must ________ what the teacher explains in the class, or you will not be able to grasp themain points of the knowledge. [ ]

They are putting too much carbon dioxide into the atmosphere, ______ prevents heat from escaping from the earth into space

The trsafety seat.