Now you may think the nation’s high unemployment rate is the_______for these leaders.However,that’s not the case.

At first Bob was puzzled by Virginia s waving, but then it _____ his mind that she was trying to tell him something.

The teachers promised to __________ the wishes of the parents before making any change. 

Billionaires Bill Gates and Warren Buffett asked American billionaires to ______ at least half of their wealth to charities.

Some insects ______ the colour of their surroundings to protect themselves.