1. 地鐵   raft   subway   cruiser   scooter   Hint Half-n-half Clue   2. 皮船   canoe   scooter   sailboat   kayak   Half-n-half Clue   3. 木筏   streetcar, tram   yacht   breakdown van, tow-truck   raft   Half-n-half Clue   4. 汽艇   monorail   motorboat   streetcar, tram   canoe   Half-n-half Clue   5. 游艇   canoe   yacht   motorboat   streetcar, tram   Half-n-half Clue   6. 班機   pickup truck, pick-up van   cruiser   scooter   airliner   Half-n-half Clue   7. 風船   cruiser   raft   canoe   sailboat   Half-n-half Clue