4: In the 'difficult years'
23: Takes to the prom, e.g.
28: Investigate, with 'into'
33: Like some garage floors
36: Shaped like a dunce cap
38: ___ fiber (flax, hemp, ramie, or jute)
39: Block passage through
42: Servers' boss, when followed by d'
47: 'Bunnies' under the bed
52: Animal with twisted horns