It is difficult for children to change their eating habit later in life. _____，parents should encourage healthy eating from an early age.

Reports say the plane crashed 15 minutes after it took off, killing all 157 passengers _____

However weak we are, we can still do something against the powerful nature as long as we are ______ prepared.

 I can't believe what he says because he is _______ changing his mind. .

However _____ they are designed, pens should function as a tool to write with.