(届北京市顺义区高三3月统一测试英语试卷)The past year has seen people around the world honoring Nelson Mandela, _____ passed away on Dec 5 at the age of 95.
But for friction (摩擦力), people ______ neither walk, nor even stand up.
It was after he got what he had desired_____ he realized it was not so important.
He was allowed to go swimming _______ he kept near the other boys.
Since he often travels on business, he can ______ himself to sleeping in any place he can find.
_____ took me almost 20 years to have the courage to ask my father this personal question.