Besides proper diet, exercise is one of the key ___________of a healthy lifestyle.

 It is important to have your eyes examined regularly to check for any sign of eye disease that may not have any ________.

(2013·四川省六校二模)Jack is an outgoing child, usually kind and helpful, but he ________ lose temper sometimes.

The American team will arrive in Paris to play a friendly match with a team that _____ French and German selected players.

I have no ________ to the plan, so long as it would not cost too much.