Highly Recommended Review Problems:
1.6, 1.7, 1.8, 1.18,  3.1, 3.2, 3.3, 3.5, 4.4, 4.5. 

Some less-highly recommended review problems: 1.5b, 1.9, 1.13a, 1.16, 3.23a, 4.6, 4.27.