greece
The host country always enters last so it would have been Great Britain.
Olympic protocol states the first athletes that enter the stadium during the opening ceremony are those from Greece in recognition of Greece being the home of the Olympics (where the Ancient Olympics first began).
The opening where water enters
It enters the body through the vaginal opening.
pupil
Russia enters the opening ceremony with 232 athletes of its total number of 250 qualifying athletes, which is the largest number for the participating countries in 2014 Olympics in Sochi this year.
the area of the opening through which light enters
The lips.
Pupil
There is an opening at the bottom of the barrel above where the gas enters. There will be a valve or collar that changes the size of the opening.
Bar Mitzvah at age 13