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21. Mary's score on the test is the highest in her class; she( ) have study very hard
22. He suggested( )to tomorrow”s exhibition together
23. It's no use( )Me not to worry.
24. Silver is the best conductor of electricity, copper( ) it closely.
25. He went ahead( )all warnings about the danger of his mission.
26. If these shoes are too big, ask the clerk to bring you a smaller (
27. They decided to chase the cow away( )It did more damage
28. The bridge was named( )the hero who gave his life for the cause of the people
29. It wasn't such a good dinner( )She had promised us
30. we( )our breakfast went an old man come to the door
