13. The voyage diaries were handed down by his great grandfather, so their brothers have kept them as ____ .
| A．the apple in their eyes | B．the apple of their mouths |
| C．the apple of their eyes | D．an apple of their eyes |
Lily seems to know a lot about Hong Kong, but she has never been there．
| A．typically | B．normally | C．actually | D．naturally |
We all know the truth there are air, water and sunlight there are living things．
| A．where | B．wherever | C．that | D．that wherever |
＿＿ her hair getting gray, she has decided to have it dyed．
| A．As | B．For | C．With | D．Though |
The invention of artificial hearts marked a turning point in the battle heart disease．
| A．among | B．for | C．against | D．between |
Some people try to knock me down, only me more determined to do better．
| A．to make | B．makes | C．having made | D．made |