A little boy asks his grandpa to tell him about his “then” and “now”. His grandpa says that ______ years ago, he ______ to the radio and ______ newspapers for news, but now he reads ______ for it. ______ years ago, he used the ______ at home and in the ______ to call people. Now he ______ a mobile phone to call people ______. ______ great changes!