1.The door opened______.
a.for itself b.by itself c.of itself d.itself
2.as..as的用法(much加在哪？)
3.This machine ____.It hasn't worked for years.
a.didn't work b.wasn't working
c.doesn't work d.isn't working
4.When first ____ to the European market,this Chinese product was popular with people.
a.introducing b.introduced
c.introduce d.being introduced
5.She looks forward every spring to ___ the flowerlined gardens.
a.visit b.paying a visit
c.walk in d.walking in

1.选C正确。for oneself为自己，代表自己
by oneself单独的，孤独的
of oneself自然而然的，自发地，自动的
itself自己，本人亲自的
2.as much as
3.根据hasn't判断，现在不能正常运转，排除A B。没有上下文提示是强调说话时的动作，所以只选C就行了。
4.选B.这是一个省略句，从句中省略了主语this Chinese product和动词was.
5.She looks forward every spring to ___ the flowerlined gardens.
a.visit b.paying a visit
c.walk in d.walking in
选D正确。look forward to +doing 排除A C.
pay a visit to +地点（没有to 所以排除掉）