Add punctuation: Payment Small quantit y TT at sight 30 in advance 70 after receiving theBL cop Large quantity LC at sight
A: Payment Small quantit y : T/T at sight, 30% in advance , 70% after receiving theB/L cop ; Large quantity : L/C at sight

Add punctuation: The videos also present the actual locations where the technology is used and the conditions to which it is exposed in practice
A: The videos also present the actual locations where the technology is used and the conditions to which it is exposed in practice.

Add punctuation: But they were not on one of the biggest shelfs were the catch used to be the greatest
A:
But they were not on one of the biggest shelfs, were the catch used to be the greatest.