把简单句合成一句符合从句

.He used to live in a big house behind which are many flowers.

I met a man at the party whose grandfather is a famous scientist.

.It is known to all that Light objects and heavy objects fall at the same speed

.Mr Smith is talking to The lady who lost the purse

We have two spare rooms upstairs,Neither of which has been much used in the past two years.

1.He used to live in a big house,behind which there are many flowers

2.I met a man at the party whose grandfather is a famous scientist.

3.As is konwn to all,light objects and heavy objects fall at the same speed.

4.Mr Smith is talking to the lady who lost the purse. 或者：
The lady to whom Mr Smith is talking lost the purse.

5.The book that he bought in our shop yesterdaywas written by Dickens.

6.We have two spare rooms upstairs,neither of which has been much used in the past two years.

1.He used to live in a big housew