--___ will you be back from your hometown.?---In two days.
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(树立) 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?