1、空格里填is， 即为 There is some milk in the fridge. 冰箱里有些牛奶。 这是there be句型，意思是“有、存在” 。milk是不可数名词，故用单数there is. 如果是复数如鸡蛋eggs则为：there are some eggs in the fridge.
2、动词在现在时态+ing， 如，我正在看书i'm reading now。
动词作名词时+ing, 如, 走路去学校真的很累. Going to school by foot is really tiring.这里的go+ing就是动名词。
填: is
因为milk 是不可名词,因此填is ,这是there be 句型.
在进行时态中动词加ing或作动名词,现在分词时动词加ing
如: She is reading in the room .
Studying English is useful .
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