There is very little ______ in protesting.It won’t help much.

They discussed the issue of the world’s climate in Durban, South Africa several times but could come to no ________.

 —How much if I wan to take one?—You can take as many as you like because they are free of _____.

Tom’s __towards guests really makes me feel embarrassed in the party. 

The __________ rate has been rising in the past decade in China，________ is reported in a recent survey. People find it hard to maintain their marriage.