—What do you think of your life in China? —The first year was , but things have gotten better.
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.