1.When (heat),water is turned into vapour.
答案:heated
2.He looked about as if (search)for something.
答案:searching
3.When first (introduce)to the market,these products enjoyed great success.
答案:introduced
4.It shamed me to say it,so I told a lie when (question)at the meeting by my boss.
答案:questioned
5.English words are easily forgotten,unless constantly (repeat).
答案:repeated
6.When (introduce) to our school,the new learning methods are popular with all the students.
答案:introduced
