IELTS candidates often use the wrong form of words or misspell words because of changes in form. Correct the mistake in each sentence

IV.  IELTS candidates often use the wrong form of words or misspell words because of changes in form. Correct the mistake in each sentence. 
1 In general, people should eat more healthy and do some exercise. healthily
2 Pesticides may be harmy to our health. 
3 Some farmers feel that using natural fertiliser is too unconvenient. 
4 The media often give usefull advice about food. 
5 There has been a slightly drop in the popularity of fast food in my country. 
6 I don't think that wealth people should get the best food. 
7 Most people can easy do some exercise. 
8 The number of people who live to 100 has increased dramaticaly.