1. 警笛   horn   wheel   gear lever   sprocket   Hint Half-n-half Clue   2. 鎖   chain   horn   tire pressure   helmet   Half-n-half Clue   3. 機関   pedal   engine   handbrake   gear lever   Half-n-half Clue   4. 緩衝器   shock absorber   exhaust pipe   engine   horn   Half-n-half Clue   5. 排気管   wheel   exhaust pipe   sprocket   helmet   Half-n-half Clue   6. 変速レバー   engine   sprocket   gear lever   tire pressure   Half-n-half Clue   7. 電線   tricycle   wheel   cable   sprocket   Half-n-half Clue