8．Ihad no difficulty in making myself understood．——青夏教育精英家教网——

8．Ihad no difficulty （毫不费力） in making myself understood．

7．Thanks to （由于） his research，the UN has more tools in the battle to rid the world of hunger．

6．Dr．Yuan is quitesatisfied/content （满意的） with his life．However，he doesn't care about being famous．

5．Theyfocus/concentrate on （集中精力于） keeping their soil rich and free of disease．

4．Organic farmers，therefore（因此），often prefer using natural waste from animals as fertilizer．

3．The train left late that night and arrived in Montreal atdawn（黎明） the next morning．

2．Necessity is the mother ofinvention．（发明）

1．Doors on modern trains openautomatically．（自动地）

20．They werereluctant\unwilling to go away．（不情愿的）

19．The ground is alwayscoveredwith fallen leaves in Autumn．（覆盖）

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