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 4. 
The exhibits were so precious that a museum 
guard was posted in every room.
 5. 
Computer graphics allowed the exhibit’s 
curators to present the lives of ancient 
Peruvians so realistically that you felt you 
were actually there.
 6. 
There were so few exhibits that we were able 
to see all of them in an hour.
B 
Answers will vary.
PRACTICE 6: Using Purpose Clauses 
(page 234)
A 2. f, 3. d, 4. b, 5. c, 6. a
Answers will vary. Possible answers include:
 2. 
For example, an artificial food called “bacon 
bits” was invented in order that consumers 
could enjoy the taste of bacon without the fat.
 3. 
Chemicals are added to many food products 
so that the foods will stay fresh longer.
 4. 
Most farmers use chemical fertilizers and 
pesticides in order that they can increase crop 
yields.
 5. 
Some farmers use only natural pest control 
methods so that they can produce organic 
crops.
 6. 
People like to buy organic farm produce in 
order that they can avoid food with chemicals.
B 1.  Most farms use chemical fertilizers and 
pesticides (in order) to increase crop yields.
 2. 
Some farmers use only natural pest control 
methods (in order) to produce organic crops.
 3. 
People like to buy organic farm produce (in 
order) to avoid food with chemicals.
PRACTICE 7: Using Contrast Clauses 
(page 236)
A 
Answers will vary. Possible answers include:
 2. 
Although both the common cold and the flu 
are caused by viruses, only the flu can be 
prevented through immunization.
 3. 
A cold develops gradually, and any fever that 
develops will be low-grade (101°F or less), 
whereas the flu often comes on abruptly, with 
a sudden high fever.