A study ________ in the USA in 1977 showed that the chemical ASA in aspirin could prevent a stroke.
—Tom, you are caught late again. —Oh, ____.
—We must thank you for taking the trouble to cook us a meal. —____.
—Do you mind if I smoke? —____
—So you missed the meeting. —____. I got there five minutes before it finished.
____ from endless homework on weekends, the students now find their own activities, such as taking a ride together to watch the sunwise.