题目内容：

    Singapore Zoo is big and beautiful. It has a history of 35 years. There are more than (超过) 3,000 animals there. You can find zebras, tigers, pandas, monkeys, lions and many other kinds of animals. There are also different kinds of birds. Some are brown, some are red. All the animals eat and sleep, in the forests (森林), not cages (笼子). The forests are their home. You can take a train to see them even in the evening.

Singapore Zoo is a good place for children to know about animals. A lot of children come here with their parents every year. The zoo opens every day and night. It doesn’t have any fences (栅栏). At night, some animals go out in the forests freely. Do you want to go to Singapore Zoo?

1.How long does Singapore Zoo have a history of? (根据短文内容回答问题)

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2.When does the zoo open? (根据短文内容回答问题)

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3.Many students are playing on the playground.（从文中找出与划线单词意思相近的词）

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4.Singapore Zoo is a good place for children to _________.（根据短文内容完成句子，词数不限）

5.文中划线单词“it” 指_______________