高一英语短文改错求助T T.看我打字辛苦的份上帮我下 - -

高一英语短文改错求助T T.看我打字辛苦的份上帮我下 - -
这是我改的：(我少改了一个,改不出来了）
Dear George,
It's been（tooken） a week after we left you familly and we are now back（加to） home.Thank you very much for showing them around your city and providing us for （去掉for）the wonderful meals.After we said goodbye to you,we went to WashingtonD.C,where（which） we stayed for three days in.My brother was so much（去掉much） fond of the museunms there that he begged my parents to staying（stay） another couple of （加the）day.However,my father had to return to （去掉to)work on Monday so we fly(flied) back last Saturday afternoon.It was really a nice experience.If you'd like to make trip to our city some day(days),I will be better than happy to be your guide.
Yours,
Mike.
这是我想的：（把错掉的我解释一下为什么我改成这样了哈T T)
①It's been（tooken） a week,貌似有 It’s take+时间这样的句型.② we are now back（加to） home,不是有be back to 么T T.③有provide sb sth 的形式么?③ another couple of （加the）day,- -我觉得应该加the,少了数量词,用冠词不可以么?④我觉得是return work啊?- -⑤这个,我记错了,fly过去式是flew.⑥some day（days）干吗不加s?
这是正确答案：
Dear George,
It's been a week after（since） we left you familly and we are now back home.Thank you very much for showing them（us） around your city and providing us for （with）the wonderful meals.After we said goodbye to you,we went to WashingtonD.C,where（which） we stayed for three days in.My brother was so much（去掉much） fond of the museunms there that he begged my parents to staying（stay） another couple of day（days）.However,my father had to return to work on Monday so we fly(flew back last Saturday afternoon.It was really a nice experience.If you'd like to make（a） trip to our city some day,I will be better（more） than happy to be your guide.
Yours,
Mike.

76.after---since it has been + 段时间 + since / before
77.them---us 下面也有提到providing us...
78.for---with provide sb with sth
79.正确
80.去掉much 考的是so … that much 是多余的
81.staying---stay
82.day----days
83.fly---flew
84.trip前a
85.better----more
另外 take took taken taking