7. She achieved remarkable things by / at the age of only sixteen, impressing everyone around her. 8. Working in / under pressure can be difficult, but it often helps people perform better. 9. At / In the beginning of the lesson, the teacher explained what we would learn today. 10. He started his career at / in law, but later decided to switch to public relations instead. 2

Here are the correct prepositions for each sentence:

7. She achieved remarkable things by the age of only sixteen, impressing everyone around her.
8. Working under pressure can be difficult, but it often helps people perform better.
9. At the beginning of the lesson, the teacher explained what we would learn today.
10. He started his career in law, but later decided to switch to public relations instead.