She came up from goodness knows where.

They often drop in at my house.

He often turned up at parties without an invitation in his days.

He dropped in on me.

He usually drops in at my place.

I have a feeling that he may blow in sometime soon.

I have a feeling that Masao may blow in sometime soon.

My dad drops in on me from time to time.

Sometimes, father will ask me unexpectedly.

I ran into an old friend three days ago.

He dropped in on me last night.

He dropped in at my house last night.

She dropped in at my house yesterday.

I ran into an old friend of mine this morning.

A fox came along.

An old friend of mine dropped in on me for the first time in ages.

That boy used to drop in on me.

She dropped in at my house yesterday.

My uncle blew in from Kobe.

I am glad to run into you here.