Years later, I began ______ what he told me right.

(2013·福建毕业班质检)It is said that sixty percent of all energy ________ in the world today is being lost as waste heat.

 Tom looked at Jenny, with tears ______his eyes, and shouted out the words ______ in his heart for years.

    —What’s up? You look down. —I have piles of papers ______, but I type so slowly.

 _____, the boy couldn't enter his house.