母液配制中,一般将其配方中的化合物分为三类,其配成的浓缩液分别称为____、_____和____。
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Dr.Smith is going to pull out one of my _________.
A. teeth
B. tooth
C. teeths
D. tooths
_____ on trees turn green in spring.
A. Leaf
B. Leafs
C. Leave
D. Leaves
______ usually go to church every Sunday.
A. The Brown
Brown
C. Browns
D. The Browns
John bought _________ for himself yesterday.
A. two pairs of shoes
B. two pair of shoe
C. two pair of shoes
D. two pairs shoes