I didn’t quite follow him because he explained the theory _____that is too abstract for me.
—Shall I lock the lab now before I go home?—________.I'll check it myself later.
—Can I ask you a rather personal question?—________
—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.