QUES: ifmondll device cant workNo sound Actually in most cases device problem is because of sys files

correct the punctuation.

CORRECTED: ifmon.dll device can't work/No sound: Actually, in most cases device problem is because of .sys files.

QUES: Basically he uses proportion supposing that the solution to the problem is that A has 10 sheep

correct the punctuation.

CORRECTED: Basically he uses proportion supposing that the solution to the problem is that A has 10 sheep.

QUES: Of the original 65 kilometres of mining tunnels which pass through 21 horizons as the underground levels are known some twelve kilometres and nine horizons can still be accessed

correct the punctuation.

CORRECTED:
Of the original 65 kilometres of mining tunnels, which pass through 21 horizons, as the underground levels are known, some twelve kilometres and nine horizons can still be accessed.