根据语境选出最恰当的一项(　　)崖壁下有几处坟地，坟前立着的石碑许多已经破碎，字迹模糊，枯水季节，伏在江里的石头已经露出水面，周围一片寂静。________________。

Thank you for ____ a new bike for me.

I’m sorry. I _________ your printer for such a long time. —Never mind.

DrPeter Spence，________ headmaster of the school，told us，“________fifth of pupils here go on to study at Oxford and Cambridge”

He always appears when we are in trouble.—We can find a true friend _________ him