A/an, plurals- singular and plural forms

It's ____ animal

• a

• an

I need __ new bed

• a

• an

it's ___ useful machine

• an

• a

I'm ___ waiter

• a

• an

Do you have ___ umbrella

• a

• an

I'm __ English student.

• an

• a

I need __ hat

• a

• an

Is he __ student?

• an

• a

We have __ ugly duck.

• a

• an

I need __ hour

• an

• a