下列各句中，表达得体的一句是

.— Do you know Uncle Tom is crazy about gardening?—Sure. He ____ his flowers in the garden now.

Traditionally, college students hold a graduation ceremony to encourage themselves before they _______ on their life journey.

The stranger stood by the window, with his eyes ______ on the hills in the distance.

We were all very much attracted by the beautiful scenery ____ we set foot in the village. [ ]