________the letters there are answers written bypeople who are supposed to know how to solve such problems.

Researchers have found clear and convincing evidence ________ happiness isthe key to better health and longer lives

When I met him the other day，it was the first time we ____ each other since we graduated from school

What’s Jim Smith’s family name —_________

(2014·日照模拟)It’s really a small world！I________we would meet here