这个玩具火车模型是我爸爸做的。

This toy train ___model was made by my dad.

通过看这个模型，你能更好地了解桥的样子。

By looking at this ___model, you can get a better idea of how the bridge will look.

他制作塑料模型飞机作为爱好。

He built a plastic ___model aircraft as a hobby.