Choose the best answer to each question. 

A keystone species is a species of plant or animal ________absence has a major effect on an ecological system.

Câu hỏi liên quan

• Choose the best answer to each question. 

  It was very difficult for the inspector to________ what recommendations he should make.

• Choose the best answer to each question. 

  While searching for gold, the Spanish found the Grand Canyon to be an impassably barrier.

• She tried to make a good  ________________ on the interviewer.   (impress)

ZUNIA12

• Each of the following sentences has an error. Find the errors and correct them.

  A dog should be checked regular by a veterinarian to ensure that it remains in good health.

• Choose the best answer

  There has been a .................... increase in people’s income over the last ten years.

• Choose the best answer to each question. 

  It was the ragtime pianist Scott Joplin ________the “Maple Leaf Rag,” perhaps the best known of all ragtime tunes.

• Choose the best answer to each question. 

  The estate agent assured us that we could ________the house at any time.

• Choose the best answer:
  If I were you, I _______ to buy that car.

• She enjoys (play)....................................... badminton.

• Choose the best answer:
  They said to me about the people and the places..........they saw in New York.

• Choose the best answer: 
  It’s the ___ difficult exercise that they have ever done so far.

• Choose the best answer

  This job is a lot of different _________what I’m used to.

• Choose the correct answer to complete each of the following sentences.

  My car was so old that I could only sell it for ………………

• Unless you hurry, we .............................. catch the bus.

• Choose the best answer to complete these following sentences: Astronauts ............... in their spaceship, but they frequently work outside now.

• Choose the best answer: 
  Some students in my class prefer ___ TV to playing sports.

• Choose the best answer to each question. 

  She was ________ she could not say anything.

• Choose the best answer to each question. 

  “What would you like to drink? “ – “ __________.”

• Choose the best answer to each question. 

  After the accident, the injured cyclist was in great________.

• Choose the best answer to each question. 

  Some sociologists believe that the _____ family is rapidly becoming a thing of the past.