用适当的关系代词完成下列短文,然后朗读或背诵,在语境中体会关系代词的用法。 Do you know the man __ 1 __ wrote this book ? He was Jason , one of the engineers __ 2 __ came from Russia in the 1950s.He worked in the same factory __ 3 __ my father once worked. When he came to China , the first thing __ 4 __ he did was to visit the factory __ 5 __ did research on trolleybuses and found out the reason __ 6 __ China was so backward in it. Then he spent every minute __ 7 __ he could spare to help China develop transportation.__ 8 __ is mentioned above , Jason was a foreigner __ 9 __ made great contributions to our country and was a kind man __ 10 __ we should say thanks.