Description Toad on the Road . Toad will roam and zoom all along the road. What can stop him? Zoom to the Moon . Sam is packing for a trip to the moon. Does he have everything he needs? The phonemes /oa/oo/ are featured in this title. In Level 3 - Yellow books, children build on the letter-sound combinations learned in levels 1 and 2. They learn consonant digraphs (sounds made up of two letters together such as 'ch' or "ll") and long vowel sounds (such as 'igh' or 'ai').