I can only do one task at a time.

He achieved success at the expense of his health.

I used to live in New York at one time.

At best he'll get 1,000 votes.

I am busy at work today.

The gentleman at arms protected the British king.

The new shopping mall is easily come-at-able from the highway.

Yom Kippur is considered the holiest day of the year for Jewish people.

At is the chemical symbol for astatine.

The scientists conducted experiments at the atomic level.