根据句意，写出括号内所给单词的适当形式。
【小题1】We love our children and our parents love theirs (they).
【小题2】If giant pandas are in danger (dangerous), they will attack people.
【小题3】luckily (luck), he was not badly hurt in the car accident last month.
【小题4】Thousands of tourists (tour) e to the Great Wall every year.
【小题5】The places marked (mark) in red are very dangerous.
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解析：
【小题1】此题重点考察代词，根据句意需要名词性的物主代词。
【小题2】be in danger表示处于困境，固定搭配。
【小题3】此题重点考察lucky的副词形式。
【小题4】由句意可知，成千上万的旅游者来参观长城故填tourists.
【小题5】marked 是过去分词，表示被动意义。