英语,仿照例子完成句子

英语,仿照例子完成句子
例：in my room there is a sofa.i sometimes lie down to rest on the sofa.
in my room there is a sofa,on which i sometimes lie down to rest.
1）is this the pen?the great writer used to write with the pen.
2）they made many suggestions.some of them are worth taking into consideration.
3）this is the house.thieves broke into the house last night.
4） don't you think the price is too high?you finally agreed upon the price.