At first, I found some tests about left-right brain on google, and here are the best test's address and my result. I think it's reliable because it has lots of questions and the result agreed with my expectation(also agreed with my result in our book).
http://www.wherecreativitygoestoschool.com/vancouver/left_right/rb_test.htm
Thank you for taking the Creativity Test. The results show your brain dominance as being:
Left Brain Right Brain
51% 49%
You are more left-brained than right-brained. Your left brain controls the right side of your body. In addition to being known as left-brained, you are also known as a critical thinker who uses logic and sense to collect information. You are able to retain this information through the use of numbers, words, and symbols. You usually only see parts of the "whole" picture, but this is what guides you step-by-step in a logical manner to your conclusion. Concise words, numerical and written formulas and technological systems are often forms of expression for you. Some occupations usually held by a left-brained person include a lab scientist, banker, judge, lawyer, mathematician, librarian, and skating judge.
Next I did grammar practice about passive at Embassy studygroup site. (But there is a wrong answer !! T.T)