Question

Answer 1

very important to brush your teeth everyday

very difficult to learn English

very fast to go by plane

easy to study Vietnamese

cheap to live in  the city

Answer 2

41. It is important to brush your teeth everyday

42. It is very difficult to learn English

43. It is very fast to go by plane

44. It is not easy to study Vietnamese

45. It is not cheap to live in a city 

Answer 3