QUES: During pregnancy its amount gradually increases and the end of the volume can reach 115 liter

correct the punctuation.

CORRECTED: During pregnancy, its amount gradually increases and the end of the volume can reach 1-1,5 liter.

QUES: There are already 1000 Spring Day events taking place all over Europe The first 1000 schools that have shared their events on our website have now been awarded a special event kit which includes guidelines stickers a map of Europe and posters

correct the punctuation.

CORRECTED: There are already 1,000 Spring Day events taking place all over Europe. The first 1,000 schools that have shared their events on our website have now been awarded a special event kit, which includes guidelines, stickers, a map of Europe and posters.

QUES: But in the later 1950s the US Senate Labor Committee under the chairmanship of John McClellan which had been investigating corruption in American labor unions began to investigate Dave Beck and the Teamsters Union Robert Kennedy was the Committee counsel responsible for this investigation

correct the punctuation.

CORRECTED:
But in the later 1950's the U.S. Senate Labor Committee under the chairmanship of John McClellan which had been investigating corruption in American labor unions began to investigate Dave Beck and the Teamsters Union. Robert Kennedy was the Committee counsel responsible for this investigation.