她的许多不快乐是由于无聊。

A lot of her unhappiness is ___due ___to boredom.

由于线路上的湿叶子，这趟火车将晚点一小时到达。

___Due ___to wet leaves on the line, this train will arrive an hour late.

首先，我想说法国是骑自行车的最佳地点，因为它的山脉和奇妙的森林。

First of all, I want to say that France is the best place to cycle, ___due ___to its mountains and fantastic forests.