重点讲解：
1. even though 即使；尽管；纵然；
例句：He kept busy on the book even though he was in great pain.
即使在疼痛难忍时，他仍然坚持写这本书。
2. fall on （庆典或特别事件）在，适逢（某日）；
例句：Christmas Day falls on a Monday.
今年的圣诞节是星期一。
3. use as 用作；
例句：Earth worms are often used as bait.
蚯蚓常用作鱼饵。
4. clean up （警方或当局）肃清，整肃（犯罪、腐败等）；
例句：Since then, the authorities have tried to clean up the sport.
从那以后，有关当局已努力整顿体育界。
5. carry out 实施；执行；实行；
例句：It is their duty to carry out this programme.
其职责就是贯彻落实这一计划。
