按所给的汉语，用英语完成下列句子，每个空格只能填一个单词。

1. 大多数肥胖症能够预防或治愈。

   Most cases of fatness can ( 1 ) ( 2 ) or ( 3 ) .

2. 雷锋一生致力于帮助那些需要帮助的人。

   Lei Feng devoted his whole life (4 ) ( 5 ) those who ( 6 ) in need of help.

3. 那位科学家宁愿尝试不成功，也不愿意放弃他的计划。

   The scientist ( 7 ) ( 8 ) try and fail than ( 9 ) ( 10 ) his plan.

4. 为了保持身体健康，我们每个人都应劳逸适度。

   ( 11 ) ( 12 ) to keep healthy, every one of us ought to achieve a ( 13 ) ( 14 ) work and rest.

5. 比起太阳系里别的行星来说，火星的外表更像地球的外表。

   The surface of Mars is ( 15 ) ( 16 ) the surface of Earth than ( 17) ( 18 ) planet in the solar system.