The website citations are formatted correctly are:
Greene, Tom. Home Composting. Hanover Growers Guild, 15 March 2010.
Web. 22 April 2011.
Lawson, Jennifer. Put Down the Pesticides. Organic Advocates, 31 May
2013. Web. 3 January 2014.
I think it is but I would say
In 2010, people in Madagascar were forced to drink from muddy puddles leading to people getting ill
The area of California in which we live is dry and arid, and yet we see grass growing in large areas around homes and office buildings. This practice is not only wasting water but is costing the city too much money—money that could be used for other projects.
Gatsby offers to return the favor of making arrangements with Daisy by offering Nick a rather lucrative business deal. Nick refuses and doesn't want to be bought.
Noun ,pronoun,gerund or clause the "object" of the preposition.