tìm và sửa lỗi sai.

1. because of a high birthrate and considered immigration, the united states population in the late nineteenth century increased tremendously from 31 million in 1860 to 76 million in 1900.

2. for most of their history, especially since the 1860's, new york city has been undergoing major ethnic population changes.

3. rocks have forming, wearing away and re-forming ever since the earth took shape.

after (shout) for help, she (take) off her shoes and (jump) in (save) him.

làm và gt hộ e ạ.

(lie) on the beach on a sunny day is pleasant.

làm và gt hộ e với ạ.

1. some relatives of mine like staying at their cabin on lake omega every summer holidays.

2. in the united states among 60 percent of the space on the pages of newspapers is reserved for advertising.

3. gilbert newton lewis, a chemist, helped to develop the modern eletron theory of valence, a theory explains the forces holding atoms together in molecules.

tìm và sửa lỗi sai ạ.