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

• I only noticed we were running lowly on petrol after we had passed the last filling station.

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

  Lisa is _______________ than Kate. (pretty)

• Do you think that the humans will ever be able to live in other planets?

ZUNIA12

• Most modern barns are both insulated, ventilated and equipped with electricity

• That it is believed that most of the earthquakes in the word occur near the youngest mountain ranges – the Himalayas, the Andes, and the Sierra Nevada.

• 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 _________

• There is evidence that the caribou originated into North America and crossed over all land bridge into Asia and evolved into the Old World’s reindeer.

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

  Take the number 7 bus and get_________ at Forest Road.

• Choose the letter A, B, C or D to complete the sentences

  Excuse me, what is the ________ fee to enter the Independence Palace?

• Near equator, the slant of the Sun’s rays is never great enough to cause temperatures to fall below the freezing point

• Choose the best option A, B, C or D to make meaningful sentence: " Next week we're _____ on an excursion."

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

  The Chairman was so angry with the committee that he decided to_________ from it

• A City University Professor reported that he discovers a vaccine which has been 80 % effective in reducing the instances of tooth decay among small children.

• Chọn một từ đúng trong ngoặc để hoàn thành các câu sau:

  We are students. ___________ school is in the town. 

•  The British believe that meeting a black cat _________ a bad luck.

• Choose the best answer to complete each of the following sentences: 

  They (not see) ______________ each other since they left school.

• Air pollution, together with littering, are causing many problems in our large, industrial cities today.

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

  They were playing in the garden when__________.

• Forgetting something usually mean an inability to retrieve the material that is still stored somewhere in the memory.

• The company suffered substantial losses after the  stock market crash and found it difficult for recovering.