问题描述：
1.Mike,you are supposed ______ your homework.But you are now watching TV! ----I've already finished my homework , Mom. A.to do B.to doing C.to be doing D.to be finished 2.Will you go to Jenny's birthday party?----I'd like to go if I_____. A.will be visited B.will not be visited C.am not invited D.am invited 3.Inventors have changed the way we live.----So,they are famous for the great things they_____(do). （请写出原因，谢谢）
问题解答：
我来补答
解题思路： 如下
解题过程：
1. ---Mike, you are supposed ______ your homework. But you are now watching TV!
---I've already finished my homework, Mom.
A. to do B. to doing C. to be doing D. to be finished
本题选A。
本题考查的是短语be supposed to do sth, “应该做某事”，相当于should do sth。
句意：---Mike, 你应该做你的作业。可是你在看电视！
---妈妈，我已经做完作业了。
2. ---Will you go to Jenny's birthday party?
---I'd like to go if I_____.
A. will be visited B. will not be visited C. am not invited D. am invited
本题选D。
本题考查了if引导的条件状语从句的时态和语态。
if 引导的条件状语从句中用一般现在时，首先排出A和B，这两项是一般讲来时。
根据句意选D，被动语态的肯定句。如果我被邀请的话我就去。
3.---Inventors have changed the way we live.
---So, they are famous for the great things they __did___(do).
句意：---发明家改变了我们生存的方式。
---是的。他们因他们所做的伟大的事情而闻名于世。
因为前面句子所描述的都是现在的情况，而他们做事情是相对于现在而言的，故应使用一般过去时，所以填did。
最终答案：略
