3 . If you want to hold a koala, you have to go to certain licensed zoos where animal experts make sure that the koalas selected for each session are in a good state for human contact and that they are handled for only a limited time and on a limited frequency of occasions. (英译汉)

4 . 春节是一个快乐的时机，在此期间我们可以和我们珍惜和关爱的人在一起度过。（occasion引导定语从句）（汉译英）

9 . Circumstances changed in 1933, when Hitler came to power in Germany. (英译汉)

10 . 单句改错
1. We will put off the picnic in the park until next week, which the weather may be better.
2. Jack suggested the sports meeting was put off till next week.
3. Ordering over a week ago, the books are expected to arrive at any time now.
4. In art criticism, you must assume the artist has a secret message hiding within the work.
5. The novel is said to have translated into many languages and sell well abroad.
6. I am writing to tell you something about the speech competition to be holding next month.
7. Comparing with her achievements, her shortcomings are, after all, only secondary.
8. There is still some doubt that the autumn sports meeting will be held on Friday in our school.
9. I have no idea that when he will come back.
10. He wrote many children’s books, nearly half of them were published in the 1990s.