13. A lifebelt is the best thing for you to rowing.
劃船時最好帶著救生圈。
還能這樣說：
You had better take a life ring with you to row.
The best thing you can take to row is a life buoy.
14. Chinese people are used to having a boat race on Dragon Boat Festival.
中國人習慣在端午節賽龍舟。
還能這樣說：
It is a custom for Chinese people to have a boat race on Dragon Boat Festival.
Dragon Boat Festival is the day when people in China go to have boat races.
應用解析：
a race against time 和時間賽跑；
the rat race 激烈的競爭（尤指為保住職位或地位）
15. People who are seasick are not suitable to go boating.
暈船的人不適合劃船。
還能這樣說：
It is not appropriate for the people who are seasick to go boating.
Go boating doesn't suit the people who are seasick.