— Oh, his father was angry with him and slapped him ____face.
A:on the
B:in the
C:in
D:on
It there anyone in your class ______ family is in the country?
如图,在长方体AC1中,AB=BC=2,AA1=2,E,F分别是面A1C1,面BC1的中心,则AF和BE所成的角为( )
The little boy is not to lift the heavy box.