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 51 to 60. 
The ability to conduct electricity is one of the key properties of a metal. Other solid materials such as silicon can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is due to how their atoms bond together. In order to bond together the metal atoms lose at least one of their outermost electrons. This leaves the metal atoms with a positive charge and they are now strictly ions. The lost electrons are free to move in what is known as a sea of electrons. Since the electrons are negatively charged they attract the ions and this is what keeps the structure together.
An electric current is a flow of charge and since the electrons in the sea of electrons are free to move they can be made to flow in one direction when a source of electrical energy such as a battery is connected to the metal. Hence we have an electric current flowing through the wire, and this is what makes metals such good conductors of electricity. The only other common solid conducting material that pencil users are likely to encounter is graphite (what the ‘lead’ of a pencil is made from). Graphite is a form of carbon and again the carbon atoms bond in such a way that there is a sea of electrons that can be made to flow as an electric current. Likewise, if we have an ionic substance like salt we can make the electrically charged ions flow to create a current but only when those ions are free to move, either when the substance is a liquid or dissolved in water. In its solid state an ionic substance like salt cannot conduct electricity as its charged ions cannot flow.
Electrical insulators are substances that cannot conduct electricity well either, because they contain no charged particles or any charged particles they might contain do not flow easily. Water itself is a poor conductor of electricity as it does not contain a significant amount of fully charged particles (the ends of a water molecule are partly charged but overall the molecule is neutral). However, most water we encounter does contain dissolved charged particles, so it will be more conductive than pure water. Many of the problems that occur when touching electrical devices with wet hands result from the ever-present salt that is left on our skin through perspiration and it dissolves in the water to make it more conductive
Which of the following could best serve as the title of the passage? 
A.Electrical Insulators             
B.Electrical Energy
C.Electrical Devices                    
D.Electrical Conductivity

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
“Give me another chance, ______?”
A.don’t you
B.aren’t you 
C.shall you
D.will you

Glossary:
University degree classifications in the UK:
- First class
- Upper second (2:1)
- Lower second (2:2)
- Third class (3)
Why did the writer not practice writing exam questions?
A.He thought the practice was rather boring.
B.He wanted to answer exam questions critically.
C.He was advised not to.
D.He thought it might prejudice staff against him.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Though ________, he prefers to teach his children in mother tongue.
A.he was in a foreign country
B.in a foreign country
C.had been in foreign country
D.to be in foreign country

__________(89)
A.shout
B.talk
C.say
D.speak

________(7)
A.add
B.edit
C.addition
D.editor

_____ was lowered to the sea bed in a glass container to make observations is debated.  
A.Alexander the Great    
B.Alexander the Great who
C. What Alexander the Great 
D.Whether Alexander the Great

II. Choose the word whose main stress is placed differently from the others in each group.

A.rename
B.problem
C.combine
D.connect

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
At this time next week, we _________ for our examination.  
A.will have sat
B.will sit  
C.will be sat
D.will be sitting

A.cleaned
B.finished
C.stopped
D.washed