PTK _A,B = 7,5 . 4 = 30 

12. had move ( sau since => QKHT)

13.was rained / were playing

14.were looking / was broke 

15.were questioning

16.was caming / were watering 

17.was talking 

18.was practicing / was reading

19.was climbing / were visited

20.was talking / was entered

21.was making / was went 

22.was crossing / was stepped / fell

23.was begining / was planted 

vì sao 11,2g chất rắn chỉ có fe2o3 thôi ạ ? Em nghĩ phải có fexoy chứ