根据句意及首字母提示补全单词。

1. Thank you for i______me to visit next week I'm sorry but I can not come

2. C______ you go to the movies with us on Friday?

3. There's going to be a guitar c______ in our school next week.

已失爆的任何防爆电气设备，都必须（），并不得在井下（）。