Your________as a student will be excellent if you develop a habit of reflecting on how you learn. (2012·浙江,7)
As is well known, the brain performs a very important _______, which controls the nerve system of the body.
—Jack Brown is very clever and he studies hard as well.—No ________ he comes out first in the exams.
—Paul has gone abroad to try his luck.—In my _______, his decision is not wise.
The financial crisis has put the world economy in a difficult _________.
Most air pollution is caused by the burning of ____ like coal, gas and oil.