1. We will have to work harder to ... changes in the system.
2. ... some friends ... if you like.
3. Sam was sure he could ... them ... to the deal.
4. Seeing him again ... it all ... .
5. Our principal responsibility is to ... the level of unemployment.
6. I don't know what's ... this ... - he's usually so friendly.
7. He was ... by his grandmother.
8. The event was unique in ... politicians, business leaders, and academics.
9. The concerto is a huge challenge but she ... it .. magnificently.
10. His work constantly ... him ... ... this problem.