Walking alone in the dark, the boy whistled to ______ his courage.(2012 .湖北)
I had just stepped out of the bathroom___ I heard the steps.
.After the new technique was introduced, the factory produced___ in 2001 as the year before.
.—I did not know you were good friends. —You___.I have known her since she moved here.You were abroad then.
.The unemployment rate in this district______ from 6% to 5% in the past two years.
His suggestion ___they have a meeting to discuss the matter is reasonable.