For each of the following sentences, choose the correct past-tense form of the verb
For help with this exercise, see Chapter 19.
example
The dogs that we know today as house pets once (to specialize) in certain tasks that made them invaluable to humans.
a. specializes
b. specialized
c. specializing
Rhodesian Ridgebacks, a playful and sociable canine breed, once (to hunt) lions alongside their masters on the plains of Africa and were called African Lion Hounds.
A. |
B. |
C. |
For example, Saint Bernards (to rescue) avalanche victims in the Alps.
A. |
B. |
C. |
Similarly, Alaskan malamutes (to pull) sleds in freezing weather.
A. |
B. |
C. |
Doberman pinschers’ strength, speed, and courage (to result) in their use as police dogs.
A. |
B. |
C. |
Irish wolfhounds, also strong and fast, (to use) their powerful jaws to hold wolves by the neck and shake them until they died.
A. |
B. |
C. |
Even breeds such as the terriers and spaniels (to help) humans.
A. |
B. |
C. |
The Scottish terrier (to chase) rats and badgers away from people’s homes.
A. |
B. |
C. |
Little cocker spaniels (to scare) birds out of bushes and trees so that they could be hunted.
A. |
B. |
C. |
The ever-popular Labrador retriever not only (to retrieve) hunted animals on land but could also swim in icy waters.
A. |
B. |
C. |
Their tireless assistance and love for their masters (to earn) dogs the well-known title of “man’s best friend.”
A. |
B. |
C. |