Please help me to correct the mistakes. They are red:
1 However well he made at school, he never seemed to be satisfied with the results.
2 A future system of solid waste managements should begin with reduction in the amount of waste
3 In 1961, America’s first manned spacecraft was launched out.
4 An American expects his or her conversation partner to respond a statement immediately, but in some other cultures, people leave silence between each statement
5 Mr. David had to sell his business because he made some unwise investments and went broke.
6 Oceans of the world exerts strong influences on the weather over the Earth’s surface.