1. 皮船   kayak   jet plane   airliner   monorail   Hint Half-n-half Clue   2. 汽艇   motorboat   breakdown van, tow-truck   kayak   monorail   Half-n-half Clue   3. 风船   pickup truck, pick-up van   sailboat   subway   streetcar, tram   Half-n-half Clue   4. 喷气机   kayak   jet plane   scooter   airliner   Half-n-half Clue   5. 单轨铁路车   monorail   streetcar, tram   canoe   cruiser   Half-n-half Clue   6. 故障搬运车，拖曳卡车   glider   cruiser   breakdown van, tow-truck   airliner   Half-n-half Clue   7. 路面电车，电车   glider   yacht   streetcar, tram   cruiser   Half-n-half Clue