Write sentences, using the verbs in the box and the information below.

box:
- argue
- claim
- estimate
- say
- report
- suggest
- think

ex: the mexican government estimates that by the year 2000 mexico city will have a population of 26 million.
-> it is estimated that mexico city will have a population of over 26 million by the year 2000.

1) aid workers think that in the early 1980s over 10 million africans moved from the countryside to the cities. why? experts argue that drought and overuse of the forests have made it impossible for many people to live on the land.

2) brazilian government sources report that over 3 million squatters live on the hills around rio de janeiro. their houses are just shacks made of cardboard, wood and tin, and conditions are extremely overcrowded.

3) water is the world's greatest killer. the world health organization (who) estimates that 25,000 people die every day from drinking dirty water.

4) medical workers say that most squatter settlements in the third world have no schools for the children, no water supplies, and no sewerage. there is little or no work for the people in these settlements, and their health is very poor.

5) the world wildlife fund claims that urban air pollution is killing people, wildlife, trees and crops. most field workers suggest that industrial pollution is running into streams and rivers. this is making the water in the third world/developing countries unfit to drink