Quiz: fill in the blank:

They have already ___ to school.

has gone, goes, was going, go, is going, went, gone, have gone, going

• Many international corporations have exploited the natural resources of countries in third world.
• Before she died, Andrew Jackson's daughter, who lives in the family mansion, used to take tourists through her home.
• The differential attractions of the sun and the moon have a direct effect in the rising and falling of the tides.
• Aeronomy is the study of the Earth's upper atmosphere, which includes their composition, temperature, density and chemical reactions.
• For the investor who has very few money, silver or bonds are good options.
• A number of sleeping pills are accompanied by such side effects as amnesia and irritable.
• Medical doctors should continuously to read medical literature so they keep abreast of medical developments.
• If it was more humid in the desert of the Southwest, the hot temperatures would be unbearable.
• Throughout the 1960s, Martin Luther King fought nonviolently for African-American right and for justice for all Americans.
• I need some rest, I will go to home.
• In an effort of expand their educational mission, TV networks are trying to have more programs for children.
• Brain growth is partially produced by the stimulate of ganglia during what is known as Rapid Eye Movement (REM) sleep.
• To generate income, magazine publishers must decide whether to increase the subscription price or selling advertising.
• If it receives enough rain at the proper time, hay will grow quickly, as grass.
• The purpose of the United Nations, broad speaking, is to maintain peace and security and to encourage respect for human rights.
• Divulging national secretes is regarded as treason and can result in imprisonment but worse.
• Agricultural scientists at the University of California have recently made a number of discoveries that could help themselves receive upcoming governmental grants.
• Daily ingestion of large quantities of Vitamin E might help people substantially lengthen the lives.
• It's essential that the temperature is not elevated to a point where the substance formed may become unstable and decompose into its constituent elements.
• Virtually all philosophers agree the beauty cannot be defined in an objective way.