The Importance of Prepositions in English Language

1 What's your opinion on nature programmes on TV? Are they dry and educational or exciting? 2 It's important to make people more aware of environmental problems in general. 3 Big changes are on the way. For example, women may be able to have babies when they are over 50. 4 The greatest discovery in the field of space research could be finding there is life on Mars. 5 Recent developments in our understanding of the brain could have enormous implications for our future. 6 We are too dependent on electricity nowadays. 7 We are wasting our money on wars when we should be using it for medical research. 8 It's a good idea to get young people involved in projects in other countries.

Discuss the ideas above. What's your opinion?