._________ it was to become was a mystery until the dust began to slowly combine into a ball moving around the sun.
Chairman Xi Jinping suggested traditional Chinese classics _______ in textbooks when visiting Beijing Normal University on the Eve of Teachers’ Day.
--- Thank you so much! How can I repay you for your kindness? --- _____ . It was nothing.
--- What’s your idea? --- My opinion is _____, _____ happens, we should not stop the reform.
Martin Smith who, at 22, is one of the male nannies (保姆) admits that it will be some time ______ male nannies are totally accepted.
We can’t _____ the fact that there is still a long way to go before we can get rid of pollution.