general remarks: you've started - that's good the next step is to see what you can understand from the information you have found and try to put it in your own words, with a few quotes and copied pictures thrown in.

some suggestions on particular projects follow

light switch

"Our brains also have a switch called a light switch" - are you sure you read it correctly?

"..the light may have some effects to the nervous system or even on the nerve cells itself" - this is not what they were doing...they found ways to interfere with normal neuron activity by inserting light sensitive proteins into neurons and using light to activate the proteins, thereby turning neurons on or off. you need to read the article again. here is one of the key sections of the newspaper article you found (i've highlighted the parts you seem to have overlooked):

"In 2003, Georg Nagel, a biophysicist then at the Max Planck Institute of Biophysics in Frankfurt, and colleagues
characterized channelrhodopsin-2 from green algae. This channel protein lets positive ions stream into cells
when exposed to blue light. It functioned even when inserted into human kidney cells, the researchers showed.
Neuroscientists realized that this pond scum protein might be used to hot-wire a neuron with light. In 2005,
Edward Boyden, then a graduate student at Stanford, Mr. Zhang and Dr. Deisseroth, joining with the German
researchers, demonstrated that the idea worked. And in separate research published last spring, Mr. Zhang and
Dr. Boyden, now at the Massachusetts Institute of Technology, each found a way to also silence neurons: a
bacterial protein called halorhodopsin, when placed in a brain cell, can cause the cell to shut down in response to
yellow light.
The Stanford-Germany team put both the “on” and “off” toggles into the motor neurons or muscle cells of
transgenic roundworms. Blue light made the creatures contract their muscles and pull back; yellow let them
relax their muscles and inch forward."

you could find some more detailed information from the researchers' own web sites, eg
http://www.stanford.edu/group/dlab/papers/Arenkiel%20Neuron%202007.pdf
contains details of the rat work with some pictures you could maybe incorporate

and http://www.technologyreview.com/read_article.aspx?id=18289 contains more information about the light switch project which may be helpful

bionanotechnology

wikipedia doesnt say much about bionanotechnology, try this instead:

http://en.wikipedia.org/wiki/Nanobiotechnology

what you wrote under the heading "Conclusion" belongs under the heading "Introduction"

i appreciate you have been taught to always end with a "conclusion" but in this case, since you are not reporting on your own research, you don't need to make your own conclusions - expecially as what you are reporting is a document that says what they hope to do, not what they've already done.

when writing a project, it's best to only copy things you can understand, otherwise....

bee navigation

a much easier project this, as there are easy sources like HSW to draw on. but you have copied too much about anatomy. it would be good to look for some other sources for a bit more info about bee navigation itself. eg, can bees see images as well as the direction of polarised light? how do they tell what is a flower when they get to the general area indicated by the waggle dance?