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93. The diligent student refused the help of others and insisted on working out the difficult maths problem _____.

92. It was good ______ you to invite me to join in the party.

91. They are going to erect(樹立) a monument _____ memory of the men who offered their lives in defense of their country.

90. --- Who is that gentleman who talked to you just now?
--- He is my uncle _____ marriage.

89. Was this piece of earthenware(陶器) made       machine or _____ hand?

88. All the people in China, poor or rich, young or old, man or woman, are on the same level _____ each other.

87. --- Could you please tell me how can I get to the post office?
--- Go straight ahead. At the end of this road, you’ll see the hospital      the left side of the park.

86. In the following spring , the seeds should be knocked _______ the seed-heads and sown .

85. You should say "I am sorry " when you knock ________ somebody.

84. Can't you keep your dog _______coming into my yard? It is always disturbing us.