询问几道英语题.希望能仔细回答.并说明理由.

询问几道英语题.希望能仔细回答.并说明理由.
1、They reached the farm on a lot sunmmer morning【该为同义句】
They----- -----they farm----the morning------a lot sunmmer【一共三个空哦】
2.To protect the environment is necessary【该为同义句】
------is necessary ----- ----the environment
3,No one knows whether Mr Li lives on the-----（八）floor of this building.
4,Go-----（横穿）the bridge .you‘ll find the library on the left.
5.David-----（穿着）an old coat every day,looking very strange.
6.I have two-----（knife）.Which one do you want?
7.We were talking on the playground when the bell----（ring）
8.The woman looked at the young man----（angry）