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TOEIC Reading 5 Exercisee 52

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Question: 
O:8:"stdClass":2:{s:8:"question";s:102:"Students are not allowed to handle these chemicals ______ they are under the supervision of a teacher.";s:7:"choices";a:4:{i:0;s:6:"unless";i:1;s:7:"whether";i:2;s:6:"except";i:3;s:2:"or";}}
Answer: 
a
TOEIC Reading 5 Category: 
content access: 
2
answer explanation: 

<p>Students are not allowed to handle these chemicals <span class="highlight">unless</span> they are under the supervision of a teacher.</p>
<p>The correct answer is (A) unless.</p>
<p>The word "unless" is used to introduce a condition that must be met in order for something to happen or be true. In this sentence, the condition is that students must be under the supervision of a teacher in order to handle the chemicals. Therefore, "unless" is the appropriate word to use.</p>