Find the mistake in each of the following sentences
1 - The rich man's son was snatched for ransom
2 - Mona told good bye to us and made for Bulgaria
3 - There is a device which controls how fast you can drive on the road you are
4 - we must save energy in our homes and work places to stop using non-renewable sources
5 - The oil made from palm trees , corn and some type of beans is called vegetable oil
6 - The panel must have gone off without me hearing it
7 - Geothermal energy does less damage than modern power stations
8 - I've decided that I'm doing more exercises in the future
9 - After the match , the players shook hands with each others
10 - Not one paper she has finished on time