1:Half an hour had gone by, but the last bus had not come yet. We had to walk to home.
2:Mary looks if she is very worried about the Chinese exam because she has not learned the text by heart.
3:Since the basketball match has been postponed. We might as well visit the museum.
4:He stayed in Australia with his parents all the way through the second Word War.
5:Since I graduated from Nanjing University in 1985,I have kind of lose touch with my classmates.
