1. The fifth graders' artwork is hung first.
2. The second graders are between the fifth graders and the third graders. Since the fifth graders' artwork is hung first, then the second graders' artwork is hung second and the third graders' artwork is hung third.
3. The third graders are to the left of the fourth graders. This means that the fourth graders' artwork is hung fourth.
Answer: 5th draders' artwork, 2nd graders' artwork, 3rd graders' artwork, 4th graders' artwork (from the left to the right).