There ____(is/are) a lot of food.为什么?

There ____(is/are) a lot of food.为什么?

is
There +be 这个表存在的句型是个固定的倒装句.be动词得在数上和后面的主语保持一致,由于food为不可数名词,所以用单数动词--is

are

is
因为food为不可数名词，作主语时谓语动词用单数。there be 句型中的主语为be动词后的名词。

用 is！

答案是is
再举例说明何时用is 和are
1.There is much water in the jar
2There is much water and stones in the jar
3.There is a pen and two books on the desk
4,There are two books and a pen on the desk