1. I saw a koala climb up a tree with its baby on its back.

2. I saw a kangaroo carry its baby in its pouch.

3.I saw three kiwis gather around the fence.

4. I saw a girl carry a koala with her arms.

5. I saw a cuscus on my left

6. I saw a cuscus creep on the left side of me.

7. I saw a cuscus move towards the kiwis.

8. It takes about ten and a half hours from Seoul to Sydney.

9. It takes about ten and half an hours from Seoul to Sydney.

(Would you like to check the sentences? Correct errors, please?)

5 - needs period

9 - should say ten and a half hours from

#4 would be better if you write "in her arms" rather than "with her arms."

1. "I saw a koala climb up a tree with its baby on its back." - This sentence is grammatically correct.

2. "I saw a kangaroo carry its baby in its pouch." - This sentence is also grammatically correct.

3. "I saw three kiwis gather around the fence." - This sentence is grammatically correct.

4. "I saw a girl carry a koala with her arms." - This sentence is grammatically correct.

5. "I saw a cuscus on my left." - This sentence is grammatically correct.

6. "I saw a cuscus creep on the left side of me." - This sentence is grammatically correct.

7. "I saw a cuscus move towards the kiwis." - This sentence is grammatically correct.

8. "It takes about ten and a half hours from Seoul to Sydney." - This sentence is grammatically correct.

9. "It takes about ten and half an hours from Seoul to Sydney." - There is an error in this sentence. The correct form should be: "It takes about ten and a half hours from Seoul to Sydney." (omit the "an" before "hours").

Please let me know if you have any further questions or if there's anything else I can assist you with!