C Circle the correct word or phrase.
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 Itis 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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