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61.Where is Mr Du? Look! He ____ on a big machine over there. A.works B.worked C.is working D.has worked 62.Stay inside， please. It ____ hard right now A.is raining B.has rained C.rains D.was raining 63.Be quiet! The child ____ . A.sleeps B.slept C.is sleeping 64.We ____ to the zoo tomorrow. A.went B.go C.shall go D.have gone 65.When ____ the Greens ____ back to China? ----Next week. A.did， come B.are， come C.will， come D.have， come 66.We ____ a sports meeting next month. A.will have B.have had C.will D.had 67.Could you tell me if it ____ tomorrow? A.rain B.will rain C.raining D.rains 68.I want to know when ____ start. | 
