________ hard he tried, he could not change his wife’s mind

In ____ accident _____ knowledge of first aid can make _____ real difference.

(2009福建顺昌模拟)——We can never forget the days _______ the two astronauts in spaceship worked together and the days ________ we spent together

“Can you _____ the lost wallet in detail” the policeman asked.

cientist spent years alone in the forest, ______ by eating wild fruit and small animals.