Na₂O ; AlCl_{3 ;} SO_{3 ;} Cu(NO₃)_{2 ;} Ba₃(PO₄)₂.

ko biết cần làm bài giải ko :)

bạn dùng bút xoá có vài chỗ ko nhìn rõ á bạn chụp lại đc ko chụp dọc chụp ngang khó nhìn quá

F T F T T

ko biết đúng ko nx :") tại thấy giống đề của tui mà chưa chữa

1 Do you like seeing a water puppet show

->Are you seeing a water puppet show?

The last time I spoke to Lan was at Halloween

->(I haven't spoken to Lan since halloween

văn minh bạn ơi 

13 Unless he has a passport,he can't travel abroad.

14 If she practises English every day, she would speak English perfectly.

15 If he is lucky, he may pass the entrance examination. 

16 If you tried hard, you could pass the exams.

17 If you kept silent, you wouldn't wake the baby up.

18 If you stopped walking, you would understand the lesson.

19 If you practises English every day , you could improve your english.

20 If you go out in the rain without raincoat, you would catch a cold.