根据句意写单词。

________ did early men make a fire?

根据句意写单词。

Thank you for ________ us to your home．

根据句意写单词。

We would ________ to travel to Beijing．

根据句意写单词。

How long does ________ take to travel from Garden City to Beijing by train?

根据句意写单词。

People may lose their ________ and homes in a fire．

根据句意写单词。

People can use fire to ________ food．

根据句意写单词。

________ people drop burning cigarette ends everywhere．

根据句意写单词。

Metals are melted and they can be made into different ________．

根据句意写单词。

Factory ________ can use fire to make glass．

根据句意写单词。

Early men ________ fire very useful．