UNIT 3, 3E Word Skills, Word families, page 35
a tired – tiredness, merry – merriment
b excited, exciting, dangerous, useful, harmless, funny, typical
c slowly, differently
d tidily – untidily, possible – impossible
UNIT 3, 3F Reading, Body clock, page 36-37
1 A young child needs about an hour more sleep than an adolescent.
2 ‘Larks’ like to go to bed early and get up early. ‘Owls’ like to go to bed late and get up late.
3 Because your blood is thicker and your blood pressure is higher in the morning.
4 Between 3 p.m. and 6 p.m.
5 How much you eat is more important.
6 Because they give off blue light, which keeps you awake
exercise noun, verb
show verb (to give information about sth), noun (entertainment performed for an audience)
work noun, verb
hard adverb (with great effort, energy or attention), adjective (not soft to touch; not easy)
record noun (the best performance ever reached in sth), verb (to write down or film facts or events so that they can be referred to later); to put music, a film, etc. onto a CD/DVD so that it can be listened to or watched again later)
light noun (the energy from the sun, a lamp, etc. that makes it possible to see things), adjective (having a lot of light; pale; not of great weight; not deep)
level noun, verb
rest noun, verb