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we should often eat vegetables and fruit , drink milk every day. Having good habits and a healthy body can also help us safe from bird flu and some other diseases. We should keep our school, family and the public place clean. The keys to Unit 3 一、 1— 5 DCCCB 6— 10 CCCDA 11— 15 BCDBA 1620 BACAA 二、 三、 31. famous, basketball, player, is, playing 32. going, hiking, , relaxing, vacation 33. Don’t to, send, postcards, photos, , bike, riding, going, sightseeing, countryside 四、 35. When are Marry and May going hiking with their parents ? 36. How are they are going to Qinghai for the ing field trip ? 37. How long are we are staying in London ? 38. What are you doing at 2:00? are you going camping with next Sunday? 五、 4044 BDFGA 六、 45— 49 ACBBB 50— 54 ADCAD 七、 55— 59 BACCB 60— 64 A DCBC 八、 65. skating 66. named 67. to attend 68. to make 69. would get 70. tried 71. playing 72. was 73. was hung(was being hung) 74. fot 九、 The National Day is ing. I am going to Dalian to visit my grandfather for vocation. I am leaving on October the first and staying there for three days. I can take walks with my grandfather and go swimming in the sea. I am also going sightseeing with my old friends around the city. I am also taking lots of photos. I will show them to my classmates after I e back.. The keys to Unit4 一、 go leaving( will leave) 二、 1115 ABCBC 1620 CBDDA 2125 BBABC 2630 BDBBC 三、 , walk 22. takes the subway air/by plane ,taxi a bike 36. far from ,take do ,leave for 四、 ,plane far ’t usually take , to do takes 五、 47. busy 48. everything 49