His Selected Poems ______ first published in 1986.
A. were
B. was
C. has been
D. is
抗菌药物青霉素的效价单位是
A. L
B. μl
C. mg
D. U
E. μg
Dean and Carolyn always put small presents in ______ stockings on Christmas Day.
A. each other's
B. each other
C. each others
D. each others'
The ______ is just around the comer and you won't miss it.
A. bicycle's shop
B. bicycle shop
C. bicycles shop
D. bicycles' shop