五、按要求完成句子。
21. I keep quiet so as not to wake up my sister.（改为同义句）
I keep quiet ________ ________ ________ ________ ________ ________ my sister.
22. I want to find something. I want to eat.（合并为一句）
I want to find something ________ ________.
23. We made a fire to keep us warm and cook food on.（改为同义句）
We made a fire ________ ________ ________ ________ ________ ________ and cook food on.
24. 昨天汤姆早起去公园散步。（汉译英）
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25. 上周我去温州看望我的祖母。（汉译英）
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in
; order
; not
; to
; wake
;  up
; to
; eat
; so/in
; as/order
; to
; keep
; us
;  warm
; Tom got up early to take a walk in the park yesterday.
; I went to Wenzhou to visit my grandmother last week.

六、语法填空。
There are many kinds of animals around the world. But more and more of them are 26. ______ great danger now. It is hard 27. ______ (believe) that there are only about 4,000 wild tigers left on earth. They don't have enough food 28. ______ (eat) or safe places to live. 29. ______ situation is very serious.
The population is becoming larger and larger. We need more places to live and more food to feed ourselves, 30. ______ we take away their land. And the water isn't safe 31. ______ (drink) because we've made it dirty. Why don't we build more nature parks so as 32. ______ (give) animals home?
Let's do something 33. ______ (help) animals and protect the environment. We should work hard 34. ______ (stop) people from killing（杀害）them. I think it's important for us 35. ______ (keep) a good environment for both animals and ourselves. Let's take action now!

in
; to believe
; to eat
; The
; so
; to drink
; to give
; to help
; to stop
; to keep