為你解答.
Smoking kills an (estimated) five million people worldwide every year.
解釋：estimated,形容詞,被估計的.
Nearly everyone failed (to pass) his driver's test on the first try.
解釋：fail to do,做某事失敗.
Today many people are paying more attention to (reducing) stress in their lives.
解釋：pay attention to doing,注意做某事.to 是介詞,后跟動名詞.
Experts (have warned) about links between smoking and health for years.
解釋：時間狀語for years,已經有多年了.是現在完成時態(tài).
I just (was watching) a wonderful football match when the lights suddenly turned off.
解釋：時間狀語“當燈熄滅時”,是過去某個特定時間,用過去進行時態(tài).