1.b 2 . d 3.d 4.c 5.d 6.b 7.b 8.a 9.c 10.c 11a 12b 13b 14.has already done 15.to get 16.was raining 17.didn't go 18.came
19 . paper was invented in the 1st century a.d by the Chinese
20 . thousands of cars are produced by this factory every year
21 . nam said that his sister liked reading old folktales
22 . mary asked me if ha long bay was in the north of Vietnam