He was unhappy when he sold his guitar.After all,he________it for a very long time.(2013·辽宁,22)
Tom Smith,_____ I was grateful, was generous ____ his time.
____ I met Nelson Mandela was a very difficult period of my life.
Neil Armstrong was the first man____ on the moon in July 1969.
Sun Yat-sen ___ the first Republic in China in 1911 after he fought for the Chinese people for many years.
Yuan Rongping is a great person ______ his life to helping farmers harvest more rice.