用所给单词的适当形式填空.Gold is _____ than silver.(valuable)Is a spaces

用所给单词的适当形式填空.
Gold is _____ than silver.(valuable)
Is a spaceship _______ than a plane?(fast)
Which one is ______,a dog,a tiger or an elephant?(heavy)
In the long jump,Peter jumped ______ than jack.(badly)
Baangkok is ______ city in the three cites,Beijing,Changsha and Bnagkok.(hot)