congratulation!the last question!ready start!1.people present?是加ed还是不加?2.long before before long比较?3.watch sb.die from cancer up.(close and personal) 为什么这句中是形容词而不是closely and personally副词?3.物料守恒

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congratulation!the last question!ready start!1.people present?是加ed还是不加?2.long before before long比较?3.watch sb.die from cancer up.(close and personal) 为什么这句中是形容词而不是closely and personally副词?3.物料守恒

congratulation!the last question!ready start!1.people present?是加ed还是不加?2.long before before long比较?3.watch sb.die from cancer up.(close and personal) 为什么这句中是形容词而不是closely and personally副词?3.物料守恒
congratulation!the last question!ready start!
1.people present?是加ed还是不加?
2.long before
before long比较?
3.watch sb.die from cancer up.
(close and personal) 为什么这句中是形容词而不是closely and personally副词?
3.物料守恒是?
4.await 与 wait 区别?

congratulation!the last question!ready start!1.people present?是加ed还是不加?2.long before before long比较?3.watch sb.die from cancer up.(close and personal) 为什么这句中是形容词而不是closely and personally副词?3.物料守恒
加ed
3看到某人因癌症而亡
3即溶液中某一组分的原始浓度应该等于它在溶液中各种存在形式的浓度之和.也就是元素守恒,变化前后某种元素的原子个数守恒.
conservation of matter

long before 是很久以前;before long是不久