19.Vitamin D helps our bodies make a special chemical, and this special chemical,________,affects our brains, making us feel happy.
—How about Christmas evening party? —I should say it was success.
It was ______ back home after the experiment.
Please tell me how the accident_____. I am still in the dark.
I hate ____ when people talk with their mouths full.
________in the computer games,the boy no longer put his heart into study.