英语单词拼写It is said that China has the largest n_____ of mobile

英语单词拼写
It is said that China has the largest n_____ of mobile phone users.
It is very hot today so it's nice to swim i_____ of climbing hills.
To my s_____,the door of my room is open,and everything is in a mess.
She has been m_____ to the old man for ten years.
We should close the door before l_____ the house.