1£®Someone saw the missing boy last playing (play) near the river.

2£®We have our classroom cleaned (clean) after school every day.

3£®With the boy leading (lead)the way£¬we found the house easily.

4£®All the parents feel very happy to see their children looked (look) after well in the nursery.

5£®The police promised that they would keep the relatives of the victim informed (inform) of everything about the investigation.

6£®When first built (build)£¬this building wasn't popular with most of the people.

7£®Worried (worry) about her son's safety£¬she came to the city by train.

8£®Everyone was seated.Then in came (come) the chairman.

9£®He laughed with delight when he heard the news.