With so much water being used in the bathroom,it is no  _____ that more   environmentally friendly technologies have come out to make better use of water resources.

(2014·海南琼海模拟)People hope that measures will be taken to________house prices rising.

The environmental problems in China may worsen if __________ unsolved.

All of us are busy going over our lessons, as the Mid-term exam is _________.

We do have trained people, but the problem is how to organize them, and ____their enthusiasm.