4) Rewrite the sentences beginning as shown or as directed in brackets:

1.Households dump waste into the river, so it is polluted.

..............................................................because......................................................

3.People cough because of the fumes from cars. (Use 'make')

.....................................................................................................

4.People don't really care about the environment. They dump waste into the lake.

If..................................................................................................................................

5.She drinks untreated water, so she has a stomachache

.........................................................................................................

6.They are going to hold a garden party to celebrate Mother's Day (change into the passive)

..........................................................................................................................................................

7.Have you finish the report yet? (change into the passive)

..............................................................................................................

8.My brother saved enough money and he bought a new computer.

After my brother.....................................................................................................

9."I'll see you here tomorrow," said Sue.

Sue said (that)....................................................................

10.Mr Quang said he had to leave then.

"......................................................," said Mr Quang.

11.My techer wouldn't let me leave early.

My techer refused.............................................................

12.Sam was taught to play the piano at the age of five.

Sam learnt...................................................................................

1) Choose the best option:

20.Hoa said that she (wants/ wanted/ has wanted) to become a teacher

21.He told me that he had to go (now/ then/ today)

22.She said that she (can/ could/ will) speak English

2) Complete the sentences with the correct form of the words given:

6.New Zealand is famous for (spectacle).......................views of forests and moutains.

12.The whole village was (complete).............................buried by the mudslide last night.

3) Use the correct form or tense of the verbs given in brackets:

3.The bus for the trip to Marble Mountains (leave)...................at 8:00 am on May 1st.

4.Hundreds of buildings (destroy)...................................when the earthquake (shake)...........................the city.

6.(people/already/leave)...............................................................their flooded homes when rescue workers (come)...............................?

7.What (you/do)..................................this time tomorrow? I (study).................................. inthe school library.

8.Try (not use)....................................this word to often othrewise your text (become).........................repetitive.

9.Whatever job I decide (do)................in the future, my parents (support)..................me.

10.He told me that he (leave)..................................... Viet Nam the next day.

\(\frac{x+2}{x-2}-\frac{1}{x}=\frac{2}{x\left(x-2\right)}\)

giai giup minh

(2x-1)²+(2-x)(2x-1)=0

giup minh voi. thanks

Đốt cháy 6,9 g C₂H₂ trong không khí thu được khí CO₂ và nước.

a) Tính V_CO2? (đktc)

b) Tính V_{ko khí}? (đktc)

Để oxi hóa trong không khí 5,4 g Al thu được Al₂O₃

a) Tính V không khí (V_O2=\(\dfrac{20}{100}\)V không khí)?

b) Để thu được lượng oxi của phản ứng trên cần bao nhiêu g KMnO₄?