Our English teacher____in the office.

问题描述:

Our English teacher____in the office.

Our English teacher works in the office.

is,
our english teacher是主语
in the office是地点状语吧(有点忘记)
句子面缺的是谓语,加上是第三人称,单数,所以我会加is

Our English teacher (is) in the office.

Our English teacher is working____in the office.