Whilethe government says there is a(n) ________supply of houses，prices of apartments have been going upthese years.

填入下面一段文横线处的语句，最恰当的一句是（ ）“ 。”叶嘉莹曾以咏荷的诗抒发感怀。她一生才情纵横，却命运多舛，孤影孑立辗转奔波多地几十载。2013年，叶嘉莹选择了“归巢”，定居南开大学，随她一起回来的还有数十箱的研究资料，单是讲课录音就有2000多个小时。“回想我这一生，实在是幸运的。现在南开就是我的家，我的根就是在中国。”回首往昔，叶嘉莹已显平静淡然。

I am sorry you’ve been waiting so long, but it’ll still be some time ________ the professor gets back[ ]

We are inschool.Our English teacher is Mr. Li.

_____ is believed that Bell invented the first telephone in1876.