1. After so many ________ (year) practice, Li Na is a well-known tennis player.
2. I ________ (read) a novel last night when I heard knocks at the door.
3. The higher the mountain is, the ________ (thin) the air is.
4. To tell the ________ (true), I don’t like the drinks in that café.
5. It’s a (an) ________ (usual) experience, few people have chances to do it.
1. years’ 2. was reading 3. thinner 4. truth 5. unusual