a or an?

___ teacher

• a

• an

___ locker

• a

• an

___ exit

• a

• an

___ English teacher

• a

• an

___ counselor

• a

• an

___ officer

• a

• an

___ science lab

• a

• an

___ eraser

• a

• an

Is ___ cafeteria on the first floor?

• a

• an

I need ____ social studies book.

• a

• an