Infinitive without to and with to

This door is broken. I don't know how.....(fix) that.

I heard someone .......(drop) a plate.

This homework is really easy .....(do). It took me only 10 minutes to finish.

Is it okay .......(tell) mom the truth? I broke her favorite vase.

I'm confused. I don't know what .....(do)

I heard someone .......(open) the window.

He used a knife .....(open) the box becaused he didn't have any scissors.

Do you know how .....(make) pizza? I really love Italian food.

My friend let me ......(borrow) his toy car. He's really nice to me.

My mom makes me......(do) the chores everyday. She thinks it's important for kids to help around the house.

I heard someone ......(kick) a ball.

I'm not sure where ......(put) this chair.

I heard someone .....(say) "yes"

I hope .....(study) in a good university when I grow up.