He doesn’t lack ______ to learn. You don’t have to tell or force him to do this or that. 

Since Malaysia Airlines MH370 Flight ______ happened on March 8th, it has aroused a widespread concern around the world.

 We drew this conclusion on the _______of research and experiments.

As long as you are sure this plan works, you should ____ with it, whatever happens. 

Joe Jones, the eldest of the eight children, had to ________ out of high school at the age of 16 to help his father on the farm.