同义句转换（每空一词）
问题描述：
同义句转换（每空一词）
You must be careful not to fall off your bike.
You must be careful ____ ____ ____ do not fall off your bike.
The villagers took potatoes from the earth for food.
The villagers ____ ____ potatoes for food.
They thought everything on the earth was going to be destroyed.
They thought that the earth was ____ ____ ____.
答
in order to
pick up
to be destroyed