初3英语句型转换题（麻烦写下正确答案的原因）

初3英语句型转换题（麻烦写下正确答案的原因）
（1） For him ,to see some of his friends as often as before is difficult.(改为同义句）
____ ____ difficult ____ ____ to see some of his friends as often as before.
(2) My mother went to Shanghai last week ,and she hasn't come back yet.(改为同义句）
My mother _____ ____ to Shanghai .
(3) He's already visited the place where his ancestors lived.(改为同义句）
He's already visited the place his ancestors ______.
(4) He interviewed twenty people for the job .(改为同义句）
He ____ ____ ____ ____ twenty people for the job.
(5) He came to see me .I was very happy .(改为同义句）
It _____ me very happy because of his coming to see me.
(6) Things have changed a lot in this place over the years .(改为同义句）
There ____ ____ many ____ to this place over the years.
(7) It has served for five years.(改为同义句）
It ____ ____ ____ service since 2002.