Either you or he _______ to give them a lecturetomorrow

Jane,when did you come here—In 2011. I____here for about 3years.

_____ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately

下面语段中画线的词语，使用恰当的一项是(　　)举国上下，对于工业明胶流入食药领域的追问已成愈演愈烈之势。随着媒体报道的深入，人们发现，不但与毒明胶沾染的药品食品种类越来越多，个中内幕也更加触目惊心。试图息事宁人的可能并不仅仅是一些不良企业，或许还包括与工业明胶利益链紧密相关的地方政府。因为一旦上级部门开始追责，地方政府也难辞其咎。

We can hardly believe that an intelligent person like Daniel ________ be asking such a silly question.