regret vt.遗憾；惋惜 n．遗憾；懊悔 牢记regret作动词时后接动词­ing形式的用法 build up逐渐增强；建立；开发 掌握build up的用法 lead to导致；造成(后果) 注意lead to中的to为介词，lead to还有"通向"的含义 focus on集中(注意力、精力等)于 熟记focus on的用法 reduce vt.减少；减缩 掌握 reduction以及和reduction相关的词组make a reduction和at a reduction of的意义与用法 keep...free from/of使......免受(影响、伤害等)；使......不含(有害物) 掌握keep的常用短语 comment n．评论；议论 vi.& vt. 表达意见；作出评论 注意comment为不同词性时的用法，记住其词组make comments on sth

　　1．What do you think would happen if tomorrow there was suddenly no rice to eat?

　　(if引导条件状语从句)

　　2．Thanks to his research，the UN has more tools in the battle to rid the world of hunger.

(thanks to引导原因状语)