M01 laws tm4 5700. indd

 4. 
The principal sources of air pollution in 
our cities are factories 
,
airplanes 
,
and 
automobiles.
 5. 
I have a dental appointment at 3 
:
30 today. 
Please pick me up at 3 
:
00.
B 
Answers will vary.
C Paris: A Visitor’s Guide to Restaurants
PRACTICE 4: Using Quotation Marks 
(page 307)
Answers will vary.
Longman Academic Writing Series 4, Fifth Edition, Teacher’s Manual 
●
Student Book Answer Key
105
© 2014 by Pearson Education, Inc. 

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PRACTICE 5: Editing Practice 
(page 307)
Aging
1
People are more likely to live long enough to 
get old in wealthy countries than in poor countries. 
2
In rich countries, people have nutritious food, 
modern medical care, good sanitation, and clean 
drinking water, but poor countries lack these 
things. 
3
As a result, the mortality rate, especially 
infant mortality, is very high. 
4
Citizens of Congo, 
Liberia, Zimbabwe, and Burundi, which are the 
world’s poorest countries, each have an average 
life expectancy of less than 60 years.
5
Citizens of 
Monaco, Macau, Japan, Singapore, Hong Kong, 
and Australia, in contrast, have an average life span 
of more than 81 years. 
6
Monaco, a very wealthy 
country, has the highest life expectancy at more than 
89 years; Chad, a relatively poor country, has the 
lowest at 48 years.