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Ability with Can and Could
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About 100 years ago, drivers ___ imagine these changes were possible.
 
couldn't
 
can't
We ___ also build new roads out of recycled materials.
 
can
 
could
In the United States, we ___ build new roads that collect heat from sunshine. The heat keeps buildings warm.
 
can
 
could
For example, a new road in Italy ___ “eat” pollution and clean the air.
 
can
 
could
Now we have roads that ___ protect the environment.
 
can
 
could
In the past, engineers ___ make roads that were environmentally friendly.
 
couldn't
 
can't
These new roads ___ last a long time without repairs.
 
can
 
could
However, now scientists ___ make new, long-lasting roads.
 
can
 
could
In the twentieth century, heavy traffic and bad weather ___ damage roads.
 
could
 
can
In the past, many roads ____ last very long.
 
couldn't
 
can't
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