sentences 47~53

I know there're a lot of grammatical errors but I'm not sure even if grammar's okay the words I used are proper. Please let me know more proper expression if there is.


47. We can build a harmonious society of harmonious a balanced democracy if we don't make mistakes over again.

48. It's fall in according to the calender but still is hot during the day. However it's chilly in the mornings and evenings and fruits begin to ripen.

49. Although he spent his most life abroad and gained fame from there, he had never forgotten his own country not even for a moment.

50. The boom popularity of climbing is not that bad but it is not good that there are a lot of considering that many accidents are caused by lack of knowledge and preparation about it.

51. They have had only been married for three 3 years but and they're already have two babies already.

52. We have enough time before the bus leaves. So why don't we go to the cafe and have a cup of coffee?

53. I should not give the children so much candy. It is natural that [not grammatically correct but sounds strange as if you are doing it on purpose]They may get sick easily.