UNIT 6

EX4
1B 2A 3A 4B
EX6
1 thick forest 2 sharp claws 3 to make growing 4 to scream for help 5 to run away in fear 6 a dark cave 7 to be fast asleep 8 to start a fire 9 to pick fruit 10 to work on an experiment
EX7
1a 2c 3b
EX8
1 had already started 2 had showed 3 had traveled 4 had been typing 5 had saved up 6 had been practicing 7 had looked 8 had leaved
EX10
must=have to, mustn't=don't have to, needn't=aren't allowed to
EX11
You mustn't take photographs in the museum.
You must buy a guidebook in the museum.
You needn't leave your bags at the door in the museum.
You mustn't touch the exhibits in the museum.
You mustn't disturb the other guests in the hotel.
You needn't tidy your room in the hotel.
You needn't the room by 12:00
You mustn't leave any valuables in the room
EX12
as....as
than
more/less+adj
EX13
Hippos are bigger teeth than giraffes.
Hippos are bigger mouth than giraffes.
Giraffes are longer than hippos.
Hippos are as heavy as giraffes.
Hippos are shorter than giraffes.
Giraffes are taller than hippos.
Hippos are more fat than giraffes.
Giraffes are run faster than hippos.
Hippos are more dangerous than giraffes.