请详细说明为什么i could not find any likely place＿﹝fish﹞nera therehow long does it take you ＿﹝walk﹞50 meters?that chair takes up too much＿﹝room﹞someing serious is ＿﹝happen﹞to metheir mother started to get＿ 〔worry〕when they didnt arrive home

1，to fish at find 做定语 ，所以是 fish at place
2，to walk take sb +时间+to do sth 句型
3，room room当作空间的含义时不可数，所以用原型
4，happening be happening to sb 意思是某人遇见了某事
5，worried get+形容词 表示变得怎么怎么样，

i could not find any likely place＿to fish﹝fish﹞nera there 动词不定式做定语,钓鱼的地方
how long does it take you _to walk﹝walk﹞50 meters?这是句型 It takes sb.some time to do sth
that chair takes up too much＿room﹝room﹞ room 这里是 空间,地方的意思,不可数名词
someing serious is ＿happening﹝happen﹞to me happen 是不及物动词,没有被动,前面有is,因此填doing,现在进行时
their mother started to get＿worried 〔worry〕when they didnt arrive home get是系动词,后面加形容词worried