有关英语问题,而且帮忙纠正我的答案……（是否正确）错的请纠正（大家各显身手吧）

有关英语问题,而且帮忙纠正我的答案……（是否正确）错的请纠正（大家各显身手吧）
1.he has to look after his sister at home.(改为疑问句）
:(Does) he have to ( look at ) his sister at home.
2.the cheapest way to get from London to Paris is by plane（特殊疑问句）
: （how ) (far) is it from one place to another
3.we are going to buy( lots of) food for picnic(对划线部分提问）
:(how) (much) food are you going to buy for picnic
4.Tom went to Shanghai(改为一般疑问句）
：(Did Tom went to Shanghai?)
5.we (studied for exams )last weekend(对划线部分提问）
：what they studied for exams last weekend?
6.She went to (the Great Wall) last summer.(对划线部分提问）
：Where she went last summer.
另外：7.Computers will make our lives more comfortable?(改为一般疑问句）
( )computers( ) our lives more comfortable.