b5.
1.responsible 2.invention 3.completed 4.had left 5.programmer 6.creative 7.technology
8.development 9.cleverest 10.solve
b6:1b 2a 3b 4a 5c
b7:
1.he asked me to keep him informed
2.scientists said that earth was the only astronomical object known....
4.thy asked me if i had been there before
5.he said that when they had been living in australia,they often had seen jim
