写出下面句子的同义句1`It's time for bed now.It's time ____ ____ ____be

写出下面句子的同义句
1`It's time for bed now.
It's time ____ ____ ____bed.
2`Shenzhen is the youngest city in Guangdong province.
Shenzhen is ___ than ___ ___city in Guangdong province.
3`How tall are you?
___ your ___?
4`How heavy is your sister?
___ your sister's ___
5`Science is my favourite subject.
I___science ___of all the subjects.
6`This is more interesting than others.
This is ___ ___ ___of all.
7`Mount Qomolangma is the highest mountain in the world.
Mount Qomolangma is ___ ___any other mountain in the world.