根据括号内的汉语提示，完成句子。

1. We miss Mr. He who ______ (教) us Chinese last year.

2. Have you ever ______ (回绝) to meet your net-friend?

3. Thanks to the government, it ______ (提供) us desks and textbooks every year.

4. Linda, one of my ______ (邻居) said she would never buy the Japanese products.

5. I can't find my backpack. I think I ______ (落下) it during the concert last night.

6. Please be careful while walking ______ (楼下).