1:The a____of the students in our school is over 1000.2:Mary needs another three pens.
问题描述：
1:The a____of the students in our school is over 1000.2:Mary needs another three pens.
1:The a____of the students in our school is over 1000.
2:Mary needs another three pens.(改为同义句）
Mary needs _____ _____ pens.
答
1.amount数量
2.Mary needs three more pens