You will need to sound design the following only using the factory patch:
A bass sound:
This should be in Mono, contain sub frequencies and benefit from timbre (filter, waveform) modulation.
A pad sound:
A rich, thick and slowly evolving pad sound useful for sustained chords and pedal notes.
A bell-like keyboard sound:
Try to emulate a bell-like sound, FM synthesis can help with this, use AMP release to emulate the natural decay of a bell sound.
A percussive keyboard sound:
A short percussive keyboard sound that can cut through the mix.
A lead sound:
An expressive lead sound that offers useful modulation, this should be in mono. The Sync synthesiser engine is a good starting point for the oscillators.
Compose a short section of music with your sounds, (1-minute max) try to make sure they contrast each other. You can also use MIDI FX and other sequencing techniques that develop parts and instrumentation.