Week 1

automobile  autograph  autocue

autopilot  autobiography  automatic

biography

Week 2

happily  angrily  merrily

cheekily  sleepily  rudely

sadly  heavily  magically

Week 3

internet interact  interlock

international  intercity  interrelate

intercity intermediate 

Week 4

eight neighbour sleigh weigh

vein  veil  reign

obey  they  grey  prey

Week 5

serious  obvious  hideous

anxious tremendous jealous

enormous glamourous

Week 6

muscle   scent  scented  descend 

scene   fascinate  fascinated  fascinating

scenes muscles