The discovery of the antibiotic penicillin in 1928 has not produced antibiotics useful for treatment of infectious diseases until 1940.

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• Since it lives in the desert, collared lizard depends from insects for water as well as for food.

• The bite of the Black Widow spider can be very inflammatory to the affected nerve hospitalization may be required.

• Electric ires carry current for lighting and outlets designing household appliances.

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• Geologists find it useful to identification fossils inrock sample because certain assemblages of species are characteristic of specific geologic time periods.

• Gunpowder, in some ways the most effective of all explosive materials, were mixture of potassium nitrate, charcoal, and sulfur.

• Earwax lubricatorsand protects the ear from foreig matter such water and insects.

• We can trust Jim. He is the kind of person who always _____ his promise. 

• Established about 1300, the Acoma Pucblo in New Mexico is believed to be oldest continuously occupied settlement in United States.

• That’s the doctor for ................ Cliff works.

• It is  nearly perfect crystal structure that gives diamonds their hardness, brilliance, and transparent

• In the whole I agree with what you’re saving, but I’m not sure about last point

• A mainframe computer is large and is usually used to operate (a network of ano computers.

• Some critics have called Theodore Dreiser’s book Sister Carrie irst  modern novel because it broke so many traditions

• Manyamny Civil War battles were fought in Virginia than in other state.

• Police sealed off the town – centre two hours meanwhile they searched for the bomb.

• The Homestead Act of 1862 granted 160 of land for any settler who would spend fiveyears on the land

• In the 1840s, Joseph Henry made discovery of electromagnetism.

• The common form of treatment it is mass inoculation and chlorination of water sources

• Because the tachinid fly is a parasite of harmful insects, much species have been imported into United States to combat insect pests

• To survive, most birds must eat at least half their own weigh food every day.