幾個改寫賓語從句的問題!

題目：

幾個改寫賓語從句的問題!
原句:(When and where to hold the meeting) is still to be discussed.
改成賓語從句
我是這樣改的:When and where the meeting to hold is still to be discussed.
原題:It was mentioned on the news.(以賓語從句續寫)
我是這樣寫的:It was mentioned on the news which is the most beautiful city in China.
這樣寫對嗎
若不對,哪裡錯了
還有,賓語從句需注意什麼?

解答：

it's still to be discussed when and where the meeting hold
反過來說就是了

It was mentioned on the news which the most beautiful city is in China
後邊的要用陳述語氣