Simple
Challenge
100

Starts with a F ends with a y and birds do this.

Fly

100

I start with G and belongs to the -et family

Get

200

We have land, water and --- transportation

Air

200

I start with L and belongs to the -et family

Let

300

Some of us take this to get to school

Taxi

300

I am a number; I comes after seven 

eight

400

Birds use this to fly

Wings

400

I am the opposite of up

down

500

I am a 3D shape 

Cube

500

The turtle is slow, but the cheetah is

fast