heavi
strong
14Oxford Discover Grammar Student Book 2 Answer Key © Oxford University
Press
Unit 15
Page 74
B
For centuries, we used horses for
transportation. A horse is stronger
than a person, and it can pull a
wagon. The wagon’s wheels make a
heavy load easier to pull.
Then people started to use canals.
Canal transportation was slow,
but the boats carried more
things. A canal boat is bigger and
heavier than a wagon. The boat is on
water. Water makes the heavy load
easier to pull. A hundred years
ago, canals and horses were very
important.
Now we don’t use horses. We use
highways and trucks. Trucks have
I
1red
2blue
3red
4blue
5black
6gray
7gray
8black
J
2Yes, they are.
3Yes, it is.
4No, it isn’t.
5No, they aren’t.
Page 77
K
1lighter, heavier
2noisier, quieter
Page 79
E
1the longest
2the oldest
3the biggest
4bigger
F
This is the longest canal in the world.
Where is it?
It’s in China. It’s the oldest canal,
too. Is it the biggest canal in the
world? No, it isn’t. The Suez Canal
is bigger than it.
Page 80
H
2shorter
3the heaviest
4big
big engines. Trucks are
horses. They can pull
Trucks are faster than
boats.
C
1stronger
2bigger, heavier
3stronger
4faster
Page 75
E
1bigger
2shorter
3faster
F
than
loads.
3slower, faster
4longer, shorter
L
1Cars are faster than bikes.
2Wagons are older than cars.
3Horses are quieter than
trucks.
M
1faster
2slower
3healthier
Unit 16
Page 78
B
5the fastest
6taller
7the oldest
8smaller
I
2A; oldest
3B is the fastest.
4A is the smallest.
J
1Yes, they are.
2No, it isn’t.
3Yes, they are.
4No, they aren’t.
5Yes, it is.
The new truck is bigger than the
old one.
Yes, the old truck is shorter than the
new one, too.
Are new trucks faster than old
ones? Yes, they are.
Page 76
H
1stronger
2heavier
3sadder
4safer
5slower
6noisier
7bigger
8nicer
9faster
10easier
11hotter
12later
People and things travel around the
world every day. People often
travel by airplane. It’s the fastest
way to travel. The fastest passenger
airplane in the world was the
Concorde. It traveled from New
York to Paris in 3½ hours!
People sometimes go on vacation
on big ships. They aren’t fast, but
they’re very big. The biggest cruise
ship is named Allure of the Seas. It’s
Big ships carry things across oceans
and through very big canals. It’s
the slowest way to transport
things, but the big ships can carry
the heaviest loads. The newest
ships are very big. The biggest
container ship is named Emma
Maersk. It’s too big for the old ports
and canals!
C
1fastest
2biggest
3heaviest
4newest
K
1bigger, biggest
2longer, longest
3faster, fastest
4heavier, heaviest
Page 81
L
1the biggest
2the busiest
3the longest
4the busiest
5the fastest
6the tallest
M
1b
2a
3b
Module 8 Review
Page 82
A
2stronger, the strongest
3easier, the easiest
4 noisier, the
noisiest 5 hotter,
the hottest 6 bigger,
enormou