I:

2. Portuguese

II:

1. C 

2. D 

3. B 

4. A

III:

1. would look 

2. had finished 

3. not to go 

4. will be having 

IV:

1. If we switch from nuclear power to renewable energy sources, the levels of radioactive pollution will decrease 

2. If people didn't throw rubbish in the street, the street would look attractive 

3. He said he hadn't said anything at the meeting the week before

4. The science teacher asked her students how many planets there were in the Solar System

5. The little boy asked his mother if they would be able to live in Saturn in next decade 

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Good Luck !!!!  )

Chúc bn hk tốt!!!!!!!!!!!!!!!!!!!!!!!