There are 20 students in our class.10 of them are playing football,the rest __ playing basketball.

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• There are 20 students in our class.10 of them are playing football,the rest __ playing basketball.
• 1.About 60 percent of the students _____ from the south,the rest of them _____ from the north and foreign countries.A.are/is B.are/are　C.is/are D.are　2.Half of the workers here _____ under 30 _____.A.is/years B.are/year old C.is/years old D.are/years of age　3.Now Tom with his classmates _____ football on the playground.A.play B.are playing　C.plays D.is playing　4.The number of pages in this dictionary _____ about two thousand.A.are B.has　C.have D.is　5.
• There are 20 students in our class.10 of them are playing football,the rest __ playing basketball.A.of us are B.of us is C.with us are D.with us is
• 一个重为2N的西红柿漂浮在水面上．（取g=10N/kg）求： （1）西红柿受到的浮力； （2）西红柿排开水的体积．
• 计算：1/1x2+1/2x3+1/3x4+.+1/2010X2011