According to the text, Li Na seems to be happy both on and ( ) the court.
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Where in the world were you when I was struggling( )my life?
A. to
B. for
C. from
D. of
My mother filled my glass ( ) milk and her glass with tea.
A. to
B. with
C. in
D. on
I didn’t tell her the bad news, as I was afraid ( ) making her sad.
A. to
B. of
C. in
D. on
She learned the rules of the games step ( ) step.
A. by
B. of
C. to
D. in