172. --- Where did you see him? --- It was in the hotel ______.
The trees ___front of the house are ___the charge of Mr. Li.
—— Do you go there ___bus? —— No, we go there ___a train.
One___ five will have the chance to join in the game.
___the gate and you’ll find the entrance___the park___the other side.
If you keep on, you’ll succeed ________.