It seems that living green is easy and affordable. A small step makes a big difference.
33.The little boy ran away_________I could asked him something about his lessons.
32.—You are so strong. —Yes,I often________in the gym.
31.—Bad luck! I have left my dictionary at the dormitory. —__________.
30.The extra room________very useful when we had visitors.
29.Don’t touch anything.Better leave things_________they are until the police arrive.