UNIT 4
Vocabulary, page 180
1.
1. skyscraper
2. crime rate
3. quality of life
4. free of charge
5. round the clock
6. landmark
7 pay a fine
8 housing
9 overcrowding
10 wealthy
2.
1. up
2. off
3. into
4. down
5. in
6 down on
7 across
8 out
3
1. dissatisfied
2. codesigned
3 unhealthy
4. overcrowded
5. reread
6 misbehave
7 misuse
8 inequality
9 impossible
10. underfed
4.
1. megacities
2. giant
3. housing
4. land
5. inequality
6 wealthy
7 equal
GRAMMAR, PAGE 181
1.
1. might
2. could
3. ought to
4. must
5 can
2
1. could/ was able to
2. couldn't / wasn't able to
3. can/ is able to
4. hasn't been able to
5. can't /aren't able to
3
1. should
2. can't
3. mustn't
4. should
5. ought
6. can't
7 would
8 could
9 be able to
10 don't have to
4
1. can't have
2. don't have to/ needn't
3. should/ ought to
4. may/ might
5. shouldn't have/ oughtn't to have
6. should have/ could have/ ought to have
7. should /ought to
8. could/ was able to
9. must have
5.
1. e
2.c
3.b
4.d
5. g
6. f
7. a
6. POSSIBLE ANSWERS
1. should have left much earlier
2. must be very tiring
3. must have stolen it
4. would have come with you
5. can't be his sisters
READING. A BLOG
1.
1.c
2.b
3.d
4.c
5.b
2.
1. the city was going to be empty as well.
2. it's affordable and empty
3. they're signs of people living in a building
4. whether people would move to the city
5. walk around a big empty city
3.
1. off the beaten track
2. draw
3. unaffordable
4. spot
5. ran into
GRAMMAR
MODALS AND MODAL PERFECTS
1.
1. shouldn't walk alone in the alley
2. might not turn up to the meeting
3. must commute by train
4. can't help us this morning
5. don't have to bring anything
6. May... park in your space today
2.
1. can't
2. must/ should/ have to
3. has to
4. can /could
5. might/ may
6. must
7. couldn't/ weren't able to
8. can
3. POSSIBLE ANSWERS
1. I should have left earlier.
2. he might have got lost
3. she could have been hurt
4. I would have visited you
5. There must have been an accident.
4.
1. should have paid.
2. must have met
3. couldn't recognise
4. would have held
5 must/ has to use
6. couldn't have said.
PAGE 31
6.
1. They will be able to apply for a council house next month
2. They shouldn't have destroyed the forest to build houses in the 1980s
3. they can't have known that plastic bags are banned. I'm sure they would have respected the laws.
4. Could we have learnt from previous mistakes?
5. Sarah needn't have waited in the queue to get the tickets last night.
7.
1. Las bibliotecas deberían abrir siempre durante todo el día.
2. Una tasa de criminalidad alta podría convertirse en un problema grave.
3. Justin parece triste. Puede que lo hayan rechazado en la entrevista.
4. No deben construir nunca un rascacielos cerca de este lugar emblemático.
5. Las autoridades deberían haber despejado la acera anoche, pero no lo hicieron.
8.
1. has become
2. which
3. has reduced.
4 saves
5 comes
6 doesn't generate
7 began
8 reached
9 when
10 has changed.
