用be动词的适当形式填空，完成句子。
1．There _____ a forest in the park.
2．There _____ many trees near the road.
3．—_____ there a village in the nature park?
—Yes, there is.
4．—_____ there three students in the classroom?
—No, there aren’t.
5．The river _____ near my village.
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