谜底是：
1. blackboard
2. a clock
3. the sun
4.a bird
5. T(tea)
6. C(sea)
7. B(bee)
8. P(pea)
9. smiles(There’s a mile between the first and the last letter.)
10. Y(why)
11. I(eye)
12. an elephant
13. a giraffe
14. the whale
15. father/daddy
16. an elephant
17. the letter “r”
18. mom
19. mushroom
20. a blackboard