Use -s where necessary
1) more than twenty million.. tourists to Great Britain every year
2) King`s cross railway station appeared in London about a hundred.. and sixty years ago.
3)Thousand.. of tourists come to London every day.
4)The Thanes is three hundred.. and forty-six kilometres long.
5) There are two hundred.. and fourteen brdges over the Thames.
6) You can see thousand.. of wonderful paintings in the National Gallery.