28. Vitamin D helps our bodies make a special chemical, and this special chemical, _______, affects our brains, making us feel happy.
_____ more visitors,the Beijing Garden Expo Park gives roses to visiting couples.
—Cathy,did you attend the lecture given by Mr.Black last night? —No.I ______ a report at the office.
— Can I look at the menu before I make an order? — Of course. ___________, madam.
Is this TV set___ you wish to have___?
Shut the window, ______ it’ll get too cold in here.