31. In the past few years, research has suggested that Vitamin D may increase the level of serotonin(血清素), one of the key neurotransmitters influencing our mood, and ________it helps to relieve mood disorders.
In the program “You Are The One” last week, everybody had the ______ that she was a good match for the young man.
I have a lot of interesting topics to discuss with you. Will you come to me after school ______?
If we fail to sell enough goods, _________ last year, we will have to ________ production.
The little girl ______ the tail of his brother’s coat the moment she saw he would hurry away without her.
— What’s the matter with you? — Oh, once again I had my best friend ___, because the expression on his face ____ his anger.