When actively hunting,dolphin send out transmitting about five signals every second.

The local economy which once used to be in crisis now depends to a great extent on menial provided by the recently development of ecotourism.

Because helicopters are capable of hovering in midair, they are particu useful for rescue missions, military operates, transportation.

Two friends Diana and Anne are talking about their friend Bob’s new hairstyle. 

- Diana: “Bob looks so impressive with his new hairstyle, Anne.” 

- Anne: “______” 

Stuart stopped to write his letter because he had to leave for hospital.

After the team of geologists had drawn diagrams in their notebooks and wrote explanations of formations which they had observed, they turned to their camp-side compare notes.

Choose the correct answer to complete the sentence. "California doesn't permit people to fish ______ a fishing license."

The artist tried stimulate interest in painting by taking his students to th museums.

I found it difficult convincing the ticket inspector that I had lost my ticket, and he believed me in the end

The Carbon atoms of the diamond are so strongly bonded that a diamond ca be scratched with other diamond.

Justice is often personified as a blind folded woman to hold pair of scales.

No sooner had the secretary hang up than the phone rang again.

Each chemical element is characterized to number of proton that an atom of that element contains, called its  atomic number

The Library of Congress, located the nation’s capital, houses history documents and photographs as well as most boo published

In the United States, among 60 percof the space on the pages of newspaper is reserved for advertising.

Someone who has ever tried to pick up spilled Mercury will agree that his element is hardhandle.

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

The directly sources of fresh water lakes are rain, melted snow and ice.

In my judgment, I think Hem is the best physicist among  the scientist the SEA region

If a person were to look up from the bottom of a deep well, he is able to see stars in the middle of the day.

The film  we saw ast night was different from that I expect.