You can drive your own car __ you have passed the driving test.
A．even if
B．as if
C．now that
D．so that

What is perhaps the unique skill that dogs possess？
A．Dogs can be domesticated.
B．Dogs can communicate with wolves.
C．Dogs can communicate with humans.
D．Dogs can be raised in the wild first and later still be domesticated.

Which of the following statements is false？
A．People know exactly how and why humans domesticated the first dogs.
B．People learned to selectively breed dogs for certain specific tasks.
C．Of all the domesticated animals, dogs seem closest to their owners.
D．Wolves raised in captivity still fall to understand human gestures:

At some later point, what did humans start to breed dogs for？
A．For looks and companionship.
B．For hunting and protection.
C．For herding livestock.
D．For fun.

What was today's most popular breed of dog, the Labrador was originally bred for？
A．For chasing prey.
B．For herding livestock.
C．Hauling nets and retrieving fish for the fishermen.
D．For keeping accompany.

He checked his car carefully lest it __ on the way.
A．breaks down
B．would break down
C．should break down
D．broke down