1.Halp an hour had gone by,but the lost bus hadn't come yet.We had to walk home.
2.Mary seems to be very worried about the Chinese exam because she hasn't learned the texts by heart.
3.Since the basketball match has been postponed we might as well visit the museum.
4.He lived in Australia with his parents all the way through World War Ⅱ.
5.Since I graduated from Nanjing Unirersity in 1985,I have kind of lost touch with my classmates.
