I cannot find any of these!! Please help?

The answer to number one is wrong. It is either the cerebrum or frontal lobe. The question is vague. The second question is referring to the right and left hemispheres of the brain separated by the corpus callosum. The third question about "cavities" in the brain, must be referring to the meninges. "Cavities" is a poor word to chose. Sinuses would be more appropriate. If you have cavities in your brain, you may want to see a doctor. Who ever wrote these questions is not too bright. For the last question, the meninges contain CSF, cerebrospinal fluid. Tell your teacher to brush up on his/her biology vocabulary. They should at least know how to ask a clear question.