There is room for three people in the back of the

问题补充：

There is room for three people in the back of the bus中间的空为什么用another而不用otherif there no buying and selling of animals,there will be no killing in the future.中间的空为甚么用is而不用are.

答案：

another three people = three other people 意思一样,位置不同

no buying and selling of animals 不买卖动物,表示“不拿动物做交易这一个概念,视为单数,故用is