用所给动词的适当形式填空，必要时可加助动词。

1．Light                       （invent）in America in the 19th century．

2．It is the first time I                        （chat）online．

3．While I                           （wait）for the bus，I met my aunt．

4．Do not forget                         （turn）off the light before you leave．

5．1 was sorry that I                         （hurt）her feeling．