Vitamin D helps our bodies make a special chemical, and this special chemical, _______, affects our brains, making us feel happy.
The girl sat there quite silent and still with her eyes ____ on the wall.
. --Do you think he will come to my birthday party? -- _____. He is a man of his word.
Between our school and the Department Store______ a 12--storeyed building.
Although a sudden change can be a bad thing, it might often be _____ in the long run.
– How do you find your journey in New Zealand?-- Wonderful! The scenery there is beautiful _____ expression.