19.Vitamin D helps our bodies make a special chemical, and this special chemical,________,affects our brains, making us feel happy.
It____ ten years ______ I graduated from university.
--Your father is sleeping. Don’t ______, will you? --No, I won’t.
______ it is to have a cold drink after an _______ game!
--When ______CAAC flight 92 _______? --Just a minute and I’ll check the timetable.
Congratulations! You _____ in English this term.