1: Gets a signature on the dotted line, perhaps
20: Between Earth and Venus, e.g.
23: Helios, to the Romans
31: Colorful aquarium fish
39: It'll make you red in the face
54: Fall off, as the tide
56: Experience a lack of oxygen, perhaps
64: Common dairy quantity
66: Fasten, as a ship's rope
69: High-ranking Boy Scout
70: Resin in adhesives and paints
71: Logic circuit element