at

He works at a bank.

He works at a bank.

We stayed at a hotel for two nights.

We stayed at a hotel for two nights.

The city looks beautiful at night.

The city looks beautiful at night.

She is studying at the university.

She is studying at the university.

I think somebody is at the front desk.

I think somebody is at the front desk.

Please sign your name at the bottom of the page.

Please sign your name at the bottom of the page.

I usually wake up at seven o'clock.

I usually wake up at seven o'clock.

He is a senior partner at the law firm.

He is a senior partner at the law firm.

He delivered a powerful speech at the graduation ceremony.

He delivered a powerful speech at the graduation ceremony.