______ is impossible if you put your heart into it.
The newspaper says if more underground lines________ next year,it will be much easier for people to travel around Nanjing.
—Excuse me, may I take a seat here?—________. The man on the seat has left.
—What did you say just now?—I asked __________.
—Did you have any problems in Britain?—Yes, _______with foreigners.
—Whose book is this?—It ________be Mary's. J. K. Rowling is her favorite writer.—No, it ______ be hers . She never brings novels to school.