Question

Direct odject.
12. the baseball pitcher threw his teammate on first base the ball.
a. pitcher
b. teammate
c. first base
d. ball
13. players usally kick or "head" the ball to their teammates on the field.
a. ball
b. teammates
c. field
d. none

Answer 1

The direct object recieves the action of the verb  (ask who or what), so in #12 it would be teammate. In #13 ball receives the action.