题目内容：

阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写1个适当的单词，在给出 提示词的空白处用括号内所给词的正确形式填空。

There's nothing better than flying to a foreign destination to visit the attractions it1. (have) to offer. Millions of people are doing the same, and why not? The world has an amazing variety of must-see sights, from breathtaking natural scenery to impressive old cities. But the problem is that too many of us 2. (visit) them at the same time, putting pressure on these delicate and ancient places. That's why a number of beauty spots and historic sites have been introducing charges or restrictions on the number of tourists. There are many reasons for this: to reduce overcrowding, to manage wear and tear on old buildings and to tidy up the mess 3. (leave) behind.