Question: The main contractor erected the framework during week 48492001 and week 22002
Please fix the punctuation.
Fixed: [The main contractor erected the framework during week 48/49-2001 and week 2-2002.]

Question: Pour mixture in portions after each levelling the surface with the help of needle roller It helps remove air bubbles which can get into the solution and ensure an even coating
Please fix the punctuation.
Fixed: [Pour mixture in portions after each levelling the surface with the help of needle roller. It helps remove air bubbles, which can get into the solution, and ensure an even coating.]

Question: This year the participants were welcomed by Dr Janez Potonik the European Commissioner for Science and Research who addressed them through a videomessage
Please fix the punctuation.
Fixed: [This year, the participants were welcomed by Dr. Janez Potocnik, the European Commissioner for Science and Research, who addressed them through a video-message.]

Question: Rock climbing is a physically and mentally demanding sport one that often tests a climbers strength endurance agility and balance along with his or her mental control
Please fix the punctuation.
Fixed:
[Rock climbing is a physically and mentally demanding sport, one that often tests a climber's strength, endurance, agility, and balance along with his or her mental control.]