A few weeks ago, while I was going home from work, I saw an old dog _________ on the side of the road. I got _________ to see why he would be there and felt shocked when I saw he was not able to ___________ his hind legs(后腿), which seemed to have been broken. He _______ me with painful looks _________ he was asking me for help. I knew I couldn’t turn my back on him when he needed ___________.

Some people who live nearby told me that he was _________ by a motorcycle and the _________ pushed him there. I went daily to give him food and water, _________ I also got a wooden board to cover him from the bright sun.

I heard on the news about the __________ weather for that weekend and __________ to bring him home with some help from my father. He called some vets to help him with his legs, __________ he was not able to stand on four and dragged the hind legs.

After some __________ and a sheltered home with love and __________, he is now able to walk with a little __________ and he even runs around now. He is so __________ and even though I have three other dogs and two cats, I made some __________ in my home and my heart for him. I feel so happy and __________ when I see his eyes. I love __________ and these six hairy babies are the most special things I __________ have.

Southern long-finned pilot whales are marine mammals with a lot to say—and they may use vocalizations (发声) to outsmart a deadly enemy.

Cetaceans (鲸类动物) such as whales and dolphins communicate through sound to find food and mates, to navigate and to interact socially. Their vocalizations _________ between species and within communities. The animals can mimic (模仿) artificial noise such as sonar, but nobody had previously recorded them _________ other cetaceans’ sounds. A new study, however, found overlap in the cetacean sound book.

Researchers listened to 2,028 vocalizations of long-finned pilot whales off the coast of Australia, the first time sounds from the species in this region have been _________ described. They were surprised to hear 19 instances of vocalizations that resembled those of orcas—the whales’ oceanic _________. “We found some calls that are, to the human ear, _________ to the killer whale calls in the same area,” says Christine Erbe, an expert in Marine Science and Technology.

Pilot whales and orcas, the two largest species of cetaceans, are often seen in the same _________ and are similar sizes, and both live in social groups. Orcas compete for food with long-finned pilot whales and are _________ their predators (猎食者) .

_________ from orca stomachs shows they do occasionally eat pilot whales. But pilot whales can mob and chase orcas away, the only cetaceans seen _________ themselves from their predator in this way.

Mimicry could serve as an __________ defense: “One theory is that if they use similar sounds, they may not be recognized as prey,” Erbe says. Pilot whales hunting or eating orcas’ food remainders might go __________ if they use orca-like calls. “This is all underwater, where light travels really poorly,” she adds. “So these animals __________ sound for detecting their prey and predators and for navigating.” Long-finned pilot whales have shown an ability to __________ between orca calls with different meanings.

Additional work would __________ whether mimicry is actually occurring. Researchers could pair their listening data with direct observations of the animals’ interactions in the wild or perhaps even play orca sounds and watch the whales’ __________.

People have been raising pigeons (鸽子) for about 10,000 years. And pigeon keepers use different kinds of pigeons for different ___. Some people use pigeons for ____. For example, in parts of the world, people cook a special meal with pigeon to celebrate the New Year. Some people also ____pigeons because they look especially ____. There are many interesting kinds of “pretty” pigeons. Different kinds of pigeons have interesting features (特点) ___ long, soft tails or designs on their heads. The ____ of these kinds of pigeons enter them in ___ and the best looking pigeons are chosen to win prizes.

But pigeons have many other ____ too. Pigeons can fly a long way without growing ____. They also have another ___sense.No matter how far from home they are, pigeons can usually fly back to where they ___. This is often called a “homing sense”. This sense makes them good for carrying ____.

In many cities around the world, pigeons live in special houses, _____ pigeon keepers spend a lot of money and time ____ their birds. When someone has a very good pigeon, he is very ____. He may also have a way to make money. But this is not usually the main ____ people keep pigeons. For some people, they keep pigeons as a hobby.

People ____ their pigeons so much that they even take them _____when they move to a new country. They ____ these birds as their children. “When you are looking at a pigeon in the sky you feel ____. It is the best feeling you have in a strange country,” a pigeon lover says.