1 у тебя пример есть , можешь договорить : because I am crazy about summer activities , for example , traveling on bicycles with my parents, miniolimpic challenges with my friends , having fun on foam water slide and so on.
2 all subjects are difficult to study but for me among those ones the most difficult is history because I am not able to remember all years and historic events.
3 motor racing is dangerous because you can break any part of your body or what is worse to have total accident
Football among these sports is less harmful but dangerous too.
Sailing is one of the most dangerous sports because you can be eaten by a shark.
And the most dangerous is mountain climbing because every time you do it you have very little chance to save yourself alive. Statistically among all climbers after their mountain travel , less then 6 per cent(%) of group comes back.