I think his Japanese has improved quite a bit, hasn't it?

I am busy with work during the daytime.

My keys are inside the house.

He took refuge in a rock cave.

If you don't drive carefully, you'll end up rear-ending another car.

I found a common rabbit in the park.

I went to buy soil to fill the hole in the garden.

He used cement to fill the hole in the wall.

He was digging a hole in the garden.

When winter comes, he goes to the lake to enjoy ice fishing.