---Mary has been trained hard for the last two years. ---______ she did so well at the track and field meet yesterday.
—The tickets to Texas are not available now.—Oh.Flights ______ fast at festivals.
Jack will hold a meeting ______ people can voice their opinions on today's global economy.
A new learning center has been built in the school, ______ students to get to know the world more easily.
—Something smells really good in here!—You ______ my Easter cookies.Have one!
—Daddy, how much do you earn an hour? —If you ______ know, $20 an hour. A. may B- must C.can D.should