Chinese President Xi Jinping, on November 30, 2013, has _____ legal and scientific prevention and control of HIV/AIDS as well as various social support for carriers and patients.
Mary wrote books to earn money while John gained his wealth _________ selling Mary’s works.
I hated it when people don’t ___________ their promises.
________ hard he tried, he could not change his wife’s mind.
------I don’t know why he has made such a silly mistake in the exam. ------ He ____________ it before he handed in the paper.
Read the passage a second time, ___________ the meaning won’t become clearer to you.