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Could I speak to ______ is in charge of International Sales please?

A. who                         B. what

C. whoever                     D. whatever

One of the most important questions they had to consider was _____ of public health.

A. what                      B. this

C. that                       D. which

My friend showed me round the town, ______ was very kind of him.

A. which         B. that         C. where        D. it

What I need is_____ book that contains ______ABC of oil painting. 

A. a; 涓嶅～        B. the; 涓嶅～     C. the; an     D. a ; the

What I need is_____ book that contains ______ABC of oil painting. 

A. a; 涓嶅～        B. the; 涓嶅～     C. the; an     D. a ; the