1
2
3
4
5
100

a or an pencil

a pencil

100

a or an 

rubber

a rubber

100

a or an 

correction pen

a correction pen

100

a or an

avocado

an avocado

100

a or an eraser

an eraser

200

a or an 

orange

an orange

200

a or an  clock

a clock

200

a or an ruler

a ruler

200

a or an

exercise book

an exercise book

200

a or an 

elephant

an elephant

300

___ sun

the sun

300

___ X-ray

An X-ray

300

___ earth

the earth

300

___  boy in red shirt

The boy in red shirt

300

___ Great Wall of China

The Great Wall of China

400

___ university

a university

400

___ world

the world

400

___ Amazon Forest

The Amazon Forest

400

___ ice-cream

an ice-cream

400

___ one day

a one day

500

___ girl in pink dress.

The girl in pink dress.

500

I like ___ desk that you gave me yesterday.

I like the desk that you gave me yesterday.

500

We have ___ hour for this class.

We have an hour for this class.

500

Do you know how to use ___ computer?

Do you know how to use a computer?

500

___ universe

The universe