The evolution of fishes is a history of constant adaptation to new possibilities, and a refined of these adaptations.

When my lost briefcase was returned with my year-long research results intact, I felt tremendously relieved. It was as if a huge heavy weight ______________ from my shoulders. 

Nocturnal creatures, raccoons forage primarily at night and spend their days rest in their dens

At the Hermitage, Andrew Jackson’s home in Tennessee, even his glasses have been left exactly where he lay them .

Choose the best option:

The Earth is one of the ___ in the solar system.

In some species of fish, such the three-spined stickleback, the male, not the female, performs the task of caring for the young.

The panda's ...... habitat is the bamboo forest.

Interestingly, the United States both produces or uses more crude oil than any other nations

Lan never goes out at night,  _    ?

“Did you invest that company, Carol?” “Yes, but now I wish I ____”. 

Choose the correct answer to complete the sentence. "With clear evidence, his company couldn't deny having _____ a large quantity of toxins into the sea."

Bells told people of happy vents, such as weddings and born or, sometimes had to announce unpleasant events such as a death.

In the beginning, radios cost much more than they do today because they turned out slowly and expensively by hand

Few people realize that the musician of the national anthem of the United States originally belonged to the British drinking song.

The news today are always full of stories about people who are unhappy.

When eggs of some species of insects hatch, the newly born insects look almost like its adult counterparts.

To save the California condor from extinction, a group of federal, local, and privately organizations initiated a rescue program.

Before she moved to California, with its much milder climate, Betty found that her health improved considerably.

Before his death, John Dewey saw his philosophy have a profound influences on education and thought in the United States and elsewhere

The company suffered substantial losses after the stock market crash and found it difficult for recovering.

What caused the explosion in the factory it is still unknown