REWRITE SENTENCES :
1. We don't visit our parents very often because they live so far away
-> If __________
2. Michael ignores Lucy, so she gets angry at him
-> If _________
3. Unless we reduce the use of water and electricity, we will have to pay more this month
-> If __________
4. Walking home alone is not a good idea
-> You should't __________
5. We get up late in the morning so we don't have time to have breakfast
-> If _________
6. If she didn't take morning exercises, she would be weak
-> Unless _________
7. They will kill him if he doesn't tell them the truth
-> Unless _________
8. They are too slow so they can't win the match
-> If ___________
9. She is too old to apply for the job
-> If ____________
10. I am not a millionaire, so I can't buy a villa in HCM city
-> If ____________
VERB FORM/ VERB TENSE :
11. I used (smoke) __________ forty cigarettes a day.
12. This house (be) __________ the family home ever since my grandfather built it 60 years ago
13. By the time he (leave) _________ the office, he had attended three meetings
14. Don't forget (do) __________ your homework tonight !
15. It (be) ___________ so dark in here the he could'n read the letter
16. If my grandfather ___________ (be) still alive, he would be a hundred today
17. I __________ (offer) to give you a lift if I had my car here
18. I had the operator (put) _________ the call through for me
19. Where _________ ( you/ choose) if you lived anywhere in the world
20. Unless you (do) _______ it carefully, you will feel sorry afterwards
Bằng phương pháp hóa học, hãy nhận biết các dung dịch mất nhãn sau :
a) HI, KNO3, Na2S, H2SO4, Na2SO4, Ca(OH)2
b) NaNO3, Na2SO4, NaCl, NaOH, Ba(OH)2
c) HI, KNO3, Na2S, H2SO4, Na2SO4, Ca(OH)2
d) K2CO3, NaOH, HCl, K2SO4, Ba(OH)2, KNO3
Viết các phương trình phản ứng chứng minh :
a) Clo là chất oxi hóa ( viết 2 phương trình )
b) Clo vừa là chất oxi hóa vừa là chất khử ( viết 2 phương trình )
c) HCl là axit ( viết 2 phương trình )
d) HCl có tính oxi hóa ( viết 2 phương trình )
e) HCl có tính khử ( viết 2 phương trình )
f) Brom có tính oxi hóa yếu hơn Clo nhưng mạnh hơn iốt ( mỗi trường hợp 1 phương trình )
g) Tính oxi hóa của Clo > Brom > Iot