_______ there a phone box near here? （ ）
A：Am
B：Are
C：Is
用下列材料做成的实心小方块，放入水中会沉下去的是（ ）。
It was the boy, rather than his brothers, that _________ for what they had done.
制作人的口腔上皮细胞临时玻片标本时，刮取细胞的部位和在载玻片上滴加的液体分别是（ ）
