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1. Global warming is thought (to be caused / is caused) by pollution.
2. There (are to be estimated/ are estimated) to be about 5,400 different species of mammals.
3. It (is to be reported/ has been reported) that gunshots have been heard in the city centre.
4. The escaped prisoner is believed (to use / to have used) a rope to climb the wall.
5. It (is to be calculated / is calculated) that about 60% of a man's body mass is water.
6. Over 200 people (are being understood / are understood) to have been injured in the explosion.
7. It is considered impolite in some cultures (to be eaten/ to eat) with your left hand.
8. There (mean / were meant) to have been 60 crates of olives in the order, not 600!
9. (It / There) has been suggested that people who don't recycle should pay more tax.
10. Your order is guaranteed (will be delivered / to be delivered) within three working days.
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