`1` A

`->` Dòng 2 

`2` C

`->` Dòng 3 

`3` B

`->`. dòng 4 

`4` C

`->` Dòng 5 

`5` A

`->` Dòng 6  

1.Because Ha Noi is ________________ populated, it is always full of noise and traffic jams.

A.densely

2.The countryside has _________________ vehicles than Ha Noi, so there is less pollution.

C.fewer

3.In Ha Noi, some families are wealthy, but some other families still live in_________________.

B.poverty

4.Some people don't have money to buy food or don't have accommodation, so they _______________ crime.

C.commit

5.There are ________________ crimes in Ha Noi than in the countryside.

A.more