用括号内所给词的适当形式填空（每空不限一词）。
Tom didn’t go to bed until midnight yesterday. He feels very______(sleep)at the moment.
Neither Tom nor his twins                (reply) to their friends’ emails during the last two weeks.
When Tom heard the news of getting a scholarship, he ________(simple) couldn’t believe his ears.
Tan Dun is good at making music by                   (control) the sound of running water.
My grandpa looks so healthy though he is already in his              (90).