Many theories on conserving the purity of water has been proposed but not one has been as widely accepted as this one.

Câu hỏi liên quan

• Choose one word or phrase marked A, B, C, or D that best complete the preceding sentence:

  It is__________ book that just a few people like it.

• Don’t tell me I’m addicted to smoke if I only have three cigarettes a day!

• The bodies of cold-blooded animals have the same temperature their surroundings, but those of warm-blooded animals do not.

ZUNIA12

• Choose one word or phrase marked A, B, C, or D that best complete the preceding sentence:

  He's still going to school__________ his injury.

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

• Choose the best option to complete the sentences:  Your watch is _______ mine. Yours is 300 dollars and mine is 250 dollars only.

• Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.

  Giving lucky money to children and the elderly is one of the most common ________ during the Lunar New Year.

• All nations may have to make fundamental changes in their economic, political, and the technological institutions if they are to preserve environment.

• Deciduous trees are ones that lose its leaves in the autumn and grow new ones in the spring.

• Choose the letter A, B, C, D to indicate the correct answer to each of the following questions:

  Ms. Nga wanted to know what time _________

• Despite of many attempts to introduce a universal language, notable Esperanto and Idiom Neutral, the effort has met with very little success.

• Choose one word or phrase marked A, B, C, or D that best complete the preceding sentence:

  ______ you finish typing that report make five copies of it and give it to aloof the officers.

• Choose one word or phrase marked A, B, C, or D that best complete the preceding sentence:

  __________ we had got on the plane, it started to rain.

• Some jellyfish make daily journeys from deep water to the surface and back, while others migrate horizontal.

• It is believed that the more frequent you exercise the greater physical endurance you will have

• The average salt content of seawater is more than three percents.

• Without any hesitation, he did a decision not to take the course.

• Mark the letter A, B, C, or D to indicate the underlined part that needs correcting in each of the following questions.

   

  George hasn’t completed the assignment yet, and Maria hasn’t too.

• You wanted me to tell you about what I was doing here and how was my life

• Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.

  Reading is the best way to ______________ your vocabulary in any language.