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____。
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