1. 沙子城堡   surfboard   sand castle   wave   shovel   Hint Half-n-half Clue   2. 铁锹   surfboard   sand castle   pail   shovel   Half-n-half Clue   3. 桶   pail   shovel   lifeguard   shell   Half-n-half Clue   4. 游泳   swim   sand castle   pail   lifejacket   Half-n-half Clue   5. 海   sand castle   sand   sea   towel   Half-n-half Clue   6. 冲浪板   sand   surfboard   swimsuit   swimming trunks   Half-n-half Clue   7. 海鸥   sea gull   pail   shell   shovel   Half-n-half Clue