Which sentence uses 'come across' correctly?

I came across an old photo while cleaning the attic

I came across the street to meet you

I came across an old photo while cleaning the attic

The bridge came across the river

She comes across as very confident in interviews

He came across the finish line first

Which sentence uses 'come by' correctly?

Good jobs are hard to come by these days

The bus will come by this route

Good jobs are hard to come by these days

I come by the office every morning at 8

Can you come by my house later for coffee?

The train came by the station too fast

She comes by the grocery store home

The new iPhone will come out next month

I need to come out from the house now

The new iPhone will come out next month

The truth finally came out after the investigation

The students came out to the classroom