精选优质文档-倾情为你奉上动词ing形式专项练习1._ (smoke) is bad for our health.2.Before he came , Id finished _(read) the whole book.3.We are considering _ (take) a trip around the island.4.The silkworm is an insect worth _.A. to know B. knowing C. to be known D. being known5.She went out without _ (say) good-bye to us.6.He sat there _(read) a novel.7.The heavy rain kept us _ (wait)for two hours.8. We found the baby _ (sleep)on the floor.