12. He often spent much time playing games. He didn't pass the exam (so)

-> ................................

13. Her father is very weak. He can't do heavy work (so.......that)

->....................................

1. I/ think/ we/ turn/ all/ lights/ fans/ when/ nobody/ classroom

=>.....................................

2. Energy-saving bulls/ should/ use/ save/ electricity

=>.........................................

3. Our teacher/ disapponinted/ we/ not learn/ lesson/ yesterday

=>...................................................

4. I/ suggest/ not/ turn/ lights/ when/ room/ light enough

=>...............................................

5. How about/ plant/ green trees/ school garden

=>.........................................

6. This is your book,...................?

7. You should attend the opening ceremony,...............?

8. Your name is Thanh,.....................?

9. He makes a lot of mistakes in pronunciation,......................?

10. The traffic was heavy yesterday,...........................?

I. Complete each sentences with a tag-question : 

1. You don't know where Ann is,......?

2. They haven't seen this film,...............?

3. You wouldn't tell anyone about that,............?

4. He'd never seen you before,.......................?

5. The Chinese invented paper in A.D . 105,.....................?

V. Rewrite these sentences : 

4. She doesn't play badminton skillfully

-> She wishes she............................

5. I'm sorry I can't come to your birthday party on Satuday

-> I wish.................

6. He said to me, '' Do this test again, please ''

-> He requested me....................

8. '' How are you? '' Martin asked us

-> Martin asked us.......................

9. '' Where have you been ? '' the morther asked her daughter

-> The morther asked her daughter..............................

10. '' Is your house near the school ? '', she asked me

-> She asked me................................

11. The teacher said to her students, '' Have you finished the test? ''

->  The teacher asked her students..............

12. He often spent much time playing games. He didn't pass the exam (so)

-> ................................

13. Her father is very weak. He can't do heavy work (so.......that)

->....................................

14. He asked, '' Do I have to do it? ''

-> He asked me................................

Những chất nào sau đây tác dụng được với nước : 
A. Fe2O3,CO2,N2O5   B. Al2O3,BaO,SiO2   C. CO2,N2O5,BaO   D. CO2,CO,BaO