为你解答.
Smoking kills an (estimated) five million people worldwide every year.
解释：estimated,形容词,被估计的.
Nearly everyone failed (to pass) his driver's test on the first try.
解释：fail to do,做某事失败.
Today many people are paying more attention to (reducing) stress in their lives.
解释：pay attention to doing,注意做某事.to 是介词,后跟动名词.
Experts (have warned) about links between smoking and health for years.
解释：时间状语for years,已经有多年了.是现在完成时态.
I just (was watching) a wonderful football match when the lights suddenly turned off.
解释：时间状语“当灯熄灭时”,是过去某个特定时间,用过去进行时态.