(2013·陕西高考)On Monday mornings it usually ________ me an hour to drive to work although the actual distance is only 20 miles

So far we have done a lot to build a low-carbon economy, but it is _____ idealWe have to work still harder[ ]

______________ about wild plants that they decided to make a trip to Madagascar for further research.

According to a UN report，one thirdof the world population have no toclean drinking water and health care.

____ four years since I joined the Army.