Improve the highlighted part of the sentence given below: Mr. Smith arrived $at$ India in June last year.

Improve the highlighted part of the sentence given below.
In fact,if it hadn't been for his $invaluable\, advice$ on so many occasions $I$ wouldn't have achieved anything in life.

Improve the highlighted part of the sentence given below.
As she was suffering from high fever,she could not $face$ the examination.

Improve the highlighted part of the sentence given below.
Although India is still $by\, far$ a poor country,it can become rich if its natural and human resources are fully utilised.

Improve the highlighted part of the sentence given below.
It became clear that the strangers were heading $into$ a serious disaster.

Improve the highlighted part of the sentence given below:
Please remind me $of\, posting$ these letters to my relatives.