Решение:
Слова для справок: HARM, STRONG, WEAK, LONG, ILL, QUICK.
- Everybody knows how harmful smoking is for the health of a smoker's health. (Harmful - вредный, health - здоровье).
- We were surprised at the strength with which he was fighting. (Strongth - сила).
- I like staying in bed after I wake up. This is my weakness. (Weakness - слабость, привычка).
- Please write down the length of time it takes you to read the text. (Longth - продолжительность).
- There is a lot of illness among the pupils just now. (Illness - болезнь).
- We did the job quickly and had some time for tea. (Quickly - быстро).
Ответ: 1. harmful, health 2. strength 3. weakness 4. length 5. illness 6. quickly