Professor Li always allows his students to voice their opinions in class, ______ sometimes their opinions are not sound.
—I had a great time in the summer holidays.We went scuba-diving in Hawaii. —Wow!________
—Thank you very much for helping me with the luggage. —________.
—Do you mind if I open the window? —________.Go ahead,please.
—What's the price of the shirt? —Two hundred dollars. —I'm afraid ________.
—What's the man talking with Mr.Li over there? —________.