用所给词的适当形式填空

小题1:My sister       ________(write) three English e-mails since last week.

小题2:We went to the bookstore ____________(buy) books yesterday.

小题3:I think it must be an ________________ (enjoy) job.

小题4:I will tell you when he _________(come) back tomorrow.

小题5:Brian walked on the street alone. Then he said to _________ (he):“I am lost”.

下列哪几项属于世界贸易组织的决策制度

A．反向协商一致

B．协商一致

C．简单多数表决通过

D．加权表决制