阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
Lake Tianchi is located in the Changbai Mountains in Jilin province. It is the 61 (high) volcanic lake in the world. There 62 (be) reports of monsters in it since the 63 (begin) of the last century. But no one really got 64 clear look at the 65 (mystery) creature.
Li Xiaohe, 66 was visiting the lake with his family, claimed 67 (see) a round black creature 68 (move) quickly through the water. Many people believe its 69 (exist). However, scientists are sceptical 70 this. Maybe in the future, this mystery can be explained.
61. highest 62. have been 63. beginning 64. a 65. mysterious
66. who 67. to have seen 68. moving 69. existence 70. about/ of
Lake Tianchi is located in the Changbai Mountains in Jilin province. It is the 61 (high) volcanic lake in the world. There 62 (be) reports of monsters in it since the 63 (begin) of the last century. But no one really got 64 clear look at the 65 (mystery) creature.
Li Xiaohe, 66 was visiting the lake with his family, claimed 67 (see) a round black creature 68 (move) quickly through the water. Many people believe its 69 (exist). However, scientists are sceptical 70 this. Maybe in the future, this mystery can be explained.
61. highest 62. have been 63. beginning 64. a 65. mysterious
66. who 67. to have seen 68. moving 69. existence 70. about/ of
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