Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Not until he               did he realize that he was adopted by his parents.
A.has grown up
B.grew up 
C.grows up 
D.had grown up

Exercise 3: Choose the best option A, B, C or D.
If there is a rubbish bin in every class, the classroom will become …………… .
A.harmful                   
B.dirtier                      
C.lighter                     
D.cleaner

Fill in the blank with the right word or phrase.
Help Lucy to ……........... these suitcases. They are very heavy.
A.carried
B.take
C.bring
D.carry

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions from 30 to 34.
Bitcoins are a form of virtual currency. In other words, they are a type of money that does not exist in the actual world. However, they can be used to purchase actual products and services from real companies.
The bitcoin system was created in 2009 by an enigmatic person named Satoshi Nakamoto. In fact, no one is sure if Satoshi Nakamoto is an actual person or a group of people. Bitcoins are designed to serve as an alternative to national currencies, such as dollars and euros. They can be used to pay for things online instead of cash or credit cards. When bitcoins are transferred from a buyer to a seller, the transaction is recorded in a public database.
Governments are concerned that bitcoins can easily be stolen by hackers. It has dawned on them that they might be used for illegal purposes. For example, stolen goods could be purchased without the government’s knowledge. Although more and more companies are beginning to accept bitcoins, the percentage of purchases made using bitcoins is minuscule compared to other online payment methods, such as credit cards. Instead, many bitcoin owners simply keep them as an investment since they believe their bitcoins will be more valuable in the future.
This may or may not be a wise approach. Currently, the value of bitcoins is fluctuating wildly, especially when compared to highly stable national currencies. Bitcoin investors are gambling on the hope that as this high-tech money becomes more widely accepted, its value will soar.
(Source: https://www.digitaltrends.com)
Why are bitcoins of great concern to governments?
 
A.Because bitcoins may be used in illegal transactions.
B.Because bitcoins will eventually replace national currencies.
C.Because the value of bitcoins is fluctuating wildly.
D.Because most of bitcoin owners are hackers.

Read the following passage and mark the letter A. B. C. or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.
Biological diversity has become widely recognized as a critical conservation issue only in the past two decades. The rapid destruction of the tropical rain forests, which are the ecosystems with the highest known species diversity on Earth, has awakened people to the importance and fragility of biological diversity. The high rate of species extinctions in these environments is jolting, but it is important to recognize the significance of biological diversity in all ecosystems. As the human population continues to expand, it will negatively affect one after another of Earth’s ecosystems. In terrestrial ecosystems and in fringe marine ecosystems (such as wetlands), the most common problem is habitat destruction. In most situations, the result is irreversible. Now humans are beginning to destroy marine ecosystems through other types of activities, such as disposal and runoff of poisonous waste; in less than two centuries, by significantly reducing the variety of species on Earth, they have irrevocably redirected the course of evolution.
Certainly, there have been periods in Earth’s history when mass extinctions have occurred. The extinction of the dinosaurs was caused by some physical event, either climatic or cosmic. There have also been less dramatic extinctions, as when natural competition between species reached an extreme conclusion. Only 0.01 percent of the species that have lived on Earth have survived to the present, and it was largely chance that determined which species survived and which died out.
However, nothing has ever equaled the magnitude and speed with which the human species is altering the physical and chemical world and demolishing the environment. In fact, there is wide agreement that it is the rate of change humans are inflicting, even more than the changes themselves, that will lead to biological devastation. Life on Earth has continually been in flux as slow physical and chemical changes have occurred on Earth, but life needs time to adapt-time for migration and genetic adaptation within existing species and time for the proliferation of new genetic material and new species that may be able to survive in new environments.
(Source: Internet)
The word "magnitude" in paragraph 3 mostly means _______ .
A.extent                      
B.ignorance                
C.greed                      
D.concem

A.complain
B.ascertain
C.campaign
D.bargain

newspapers than read day morning national newspapers
A.newspapers
B.than
C.day
D.national

Choose the answer which has the same meaning with the underlined word

The conference continued after a ten-minutes break.
A.took part in  
B.struggled against  
C. went on   
D.came back

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.

A.return                                  
B.market                     
C.process                   
D.office

Mark the letter A, B, C or D on your sheet to indicate the word(s) OPPOSITE in meaning to the underlined words in each o f the following sentences.
After five days on trial, the court found him innocent of the crime and he was released.
A.benevolent
B.innovative
C.guilty
D.naive