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Unit 9 when was it invented ?
　　 一： 1. invented 2.invention 3.adjustable 4.heat 5.slippers 二： 1~5 CBCCC
　　 三： 1. What, used for 2. Who , invented 3. is , cleaned 4.must be repaired 5. to see
　　 Section B
　　 一： 1.notice 2. salty 3.produced 4. remain 5.pleasant
　　 二: 2.too thin 2.by accident 3.According to, was discovered 4. by mistake 5.in this way ,in the end 6.fell into
　　 三: 1~5:AADCD 6~10:BDBDC 11~12 :AC
　　 四: for, on, Who , think, are, inwentions, is , most
　　 Self Check and Reading
　　 一: 1.century 2.knock 3.below 4.wooden 5.towards 6. developing 7.divided 8.active 9.aim 10.create
　　 二: 1.helpful 2.invention 3.salt 4.the most popular 5.safety 6.wood
　　 三: 1.It is believed 2.named 3. to learn 4.was sent 5.was handed in 6.Was ,cleaned 7.found him 8.When was, invented
　　 四: 1~5:BADBA 6~10:CADAB
　　 五: 1~5:ABCAC
　　 6.He grew vegetables in his garden and sold them.With the money he set up a chemical lab.
　　 7.Yes.Because he was awarded 1368 separate and distinct patents during his lifetime.
　　 8.February 11th,1847 9.October 18th ,1931 10.America 11.Built a lab 12. 1368
　　 13. His first patented invention was an electrical vote recorder in 1868.
　　 14. 1876~1877,invented the phonograph.
　　 15.1900~1910, invented and perfected and steel alkaline storage battery.
　　 Unit10 By the time I got outside ,the bus had already left
　　 Section A
　　 一： 1.lock 2.verslept 3.rush 4.relative 5.broke
　　 二： 1. had left 2.had left 3.to come 4.had cooked 5.doesn’t rain 6.had had 7. finishing 8.had learnt
　　 三: 1~5:CBBAB
　　 四: 1.walking, on time 2.been late for ,came ,close 3.go off ,overslept 4.broke down 5.ran off