3.(distinguish/distinguishing/distinguished) a.These are some features that_spoken English from written English. b.He is not an ordinary man;he is a judge. Key: a.distinguish b.distinguished 4.(contribute/contributing/contribution) a.Both the listener and the speaker should make to the smooth development of a conversation. b.A proper amount of exerciseto good health. Key: a.contribute b.contributes 3. (distinguish/distinguishing/distinguished) a. These are some features that _____ spoken English from written English. b. He is not an ordinary man; he is a _____ judge. Key: a. distinguish b. distinguished 4. (contribute/contributing/contribution) a. Both the listener and the speaker should make _____ to the smooth development of a conversation. b. A proper amount of exercise _____ to good health. Key: a. contribute b. contributes