One of the consequences of our planet's being warming up is a（n）_______ in the number of natural disasters. 

The soldiers have to stand for hours without changing ________.

For the young, ______ should be showed to their parents, teachers and old people.

-----Hello, Jessica! What happened?----- I could not hear you clearly because my mobile phone could not receive a good ________.

 Mr. Barret doesn’t think that all bad language should be allowed. In his opinion, there are ______ that should be kept up.