Choose the correct item.
1 You have to be in/at least 178 cm to work as a soldier in the National Guard.
2 You should never give off/up! Keep trying and you will succeed.
3 Most teenagers listen to music at/in their free time.
4 My parents blew up/out a lot of balloons for my birthday.
5 Maria has a great sense with/of humour and always makes me laugh.