Molecules 1 and 2 enter the cell and glucose leaves the cell through the process of?

Diffusion  

Explanation:

The molecules of is moving from inside of the cell to the outside of the cell, Inside of the cell has 3 molecule of glucose and outside of the cell has 1 molecules.

In this case the higher concentration of glucose is inside the cell and outside of the cell has lower concentration of glucose.

Diffusion is the process by which the glucose molecules will move from inside  to outside of the cell.