This is Tom speaking. Is Mr. Brown in, please —_________ .

It remains doubtful ______ immediate measures could be taken to prevent underground water pollution.

_____ this village is extremely poor, the people think it is so important to keep the school going.[ ]

Andrew is _______ active boy, but he has ________ unhealthy lifestyle.

We must try our best to stop pollution ______a low-carbon(低碳)life.