.--- I’m sorry I stepped outside for a smoke. I was very tired.. --- There is no ________ for this while you are on duty.

Books are a worthy invention of human history since they make it possible for us to make a__of human’s thoughts.

The government has raised the tax on urban building (房产税) with the ______ of controlling the price of buildings.

Three criminals were caught and asked to aid in the           .

 It was such a ______ to have spent a day with the local family.