Quiz: fill in the blank:

He ___ you very well since a long time.

have known, will know, is knowing, knowing, know, was knowing, knows, were knowing, knew, known

• If it was more humid in the desert of the Southwest, the hot temperatures would be unbearable.
• Aeronomy is the study of the Earth's upper atmosphere, which includes their composition, temperature, density and chemical reactions.
• With special enzymes that are call restriction enzymes, it is possible to split off segments of DNA from the donor organism.
• A complex amount of linguistic information can be procured from a largest collegiate dictionary.
• How many dinosaurs initially survived the asteroid impact with the Earth, which ultimately cause the extinction of the species, is still open to question.
• If biennials were planted this year, they will likely to bloom next year.
• For the investor who has very few money, silver or bonds are good options.
• Nomadic people use dung as their mainly fuel source.
• Although it can be derived from oil, coal, and tar, kerosene is usually produced by refine it from petroleum.
• If it receives enough rain at the proper time, hay will grow quickly, as grass.
• In an effort of expand their educational mission, TV networks are trying to have more programs for children.
• Anders Celsius, a Swedish astronomer, devised the temperature scale what bears his name.
• Reptiles must always to avoid extremes of temperature if they are to maintain appropriate body heat.
• Before she died, Andrew Jackson's daughter, who lives in the family mansion, used to take tourists through her home.
• An orangutan is similar to a human because has a nearly identical DNA pattern.
• Heavy oxygen, termed deuterium, composes of atoms which are ten percent heavier than those of oxygen.
• The differential attractions of the sun and the moon have a direct effect in the rising and falling of the tides.
• Medical doctors should continuously to read medical literature so they keep abreast of medical developments.
• Brain growth is partially produced by the stimulate of ganglia during what is known as Rapid Eye Movement (REM) sleep.
• Divulging national secretes is regarded as treason and can result in imprisonment but worse.