Remove 'too'/ Use 'so -that- not.'

1)He is too weak to walk fast.
Ans:He is so weak that he can not walk fast.
2)Rahul is too dull to answer a simple question.
Ans-: Rahul is so dull that he can not answer a simple question.
3)My grandmother is too old to stand without any support.
Ans-: My grandmother is so old that she can not stand without any support.
4)The question was too difficult for me to answer.
Ans- : The question was so difficult  that I could not answer.
5)The jar is too heavy for the children to pick it up.
Ans-: The jar is so heavy that they can not pick it up.
6)His father is too strict to speak before him.
Ans-: His father is so strict that he (one)can not speak before him.
7)Asha was too small to understand the simple things.
Ans-: Asha was so small that she could not understand the simple things.
8)The distance between my home and college is too long to walk on foot.
Ans-: The distance between my home and college is so long that I can not walk on foot.
9)The syllabus of 12th std is too vast  for us to  complete it upto the month of December.
Ans-: The syllabus of 12th std is so vast for us that  we can not complete it upto the month of December.
10)The activity sheet is too lengthy for the students to solve it  within three hours.
Ans-: The activity sheet is so lengthy for the students that they can not solve it within three hours.