1.return it 中it 改成them 2.some 改any 因为前面是books,any表任意一本书
1.there are 中改is因为 food是不可数名词 2. world 前加 the 世界应为the world 别的实在看不出来
1,return it ->return them
some of the books ->any of the books
2,populations->people
there are not enough food->there is not enough food
die of->die from
1return-returned
2are-is
第二行的are-is
1return-returning it-them 2are-is thousand-thousands die of-die from