(1)Half an hour had gone by,but the bus had not come yet. We had to go home on foot.
(2)Mary seems to be worried about the Chinese examination,because she has not learned the text by heart.
(1)Half an hour had gone by,but the bus had not come yet. We had to go home on foot.
(2)Mary seems to be worried about the Chinese examination,because she has not learned the text by heart.