is he jack 与Are you HelenHelen也不是复数为啥要用are呢,不用is呢,用are对吗

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• is he jack 与Are you HelenHelen也不是复数为啥要用are呢,不用is呢,用are对吗
• 1） About 40 _____of the population of that country____on farms.A.percent;lives B.percent;live C.percents;live D.percents;lives 为什么选B,40 后面不用percent的复数吗?About 40 _____of the population也不是复数吗?补充：this kind of books和Books of this kind 的区别,那个是复数那个是单数?2）The bell is rung if there is a fire.为什么is后面用rung,不用runging呢?3） l have taken care of your children ___ you were away.A.during B.since C.except D.while 我怎么感觉B也对呢?4） He is my son,_____ a better son doesn't exis
• it's C_____ today.根据首字母,完成填空.这里应该填什么.
• on population什么意思全句为“Kangkang is reading a report on population in the newspaper.