3. Choose the correct preposition at/in/under/by 1/ ...the age of 2/ ...the beginning of his career 3/ work ...pressure 4/ ...charge of the shop 5/ a career ...advertizing 6/ ... the end of 2014

Here are the correct prepositions for each phrase:

1. at the age of
2. at the beginning of his career
3. work under pressure
4. in charge of the shop
5. a career in advertising
6. at the end of 2014

If you have any more questions, feel free to ask!