there are many people study English 的改错题答案是将STUDY前加WHO 但我改的是STUDY变成STUDING 请问这样到底对不对啊,可以给可详细的答案么啊

There are many animals______farm There are many sweets. There are many fruits, too how many legs are there? There are many reasons____travelling abroad. There are many sweets.翻译 there are many differences between how many stop are there there are many _____________(fish ) How many pears are there? How many stars are there? How many birdges are there? HOW MANY BOOKS ARE THERE there are many things（） How many people are there? There are many horses是什么意思 There are many fritus.(改错) There are many trees planted There are many trees on____