Classifying attributive clauses indicate a class to which the person or thing denoted by the antecedent (a noun or pronoun modified by the attributive clause) belongs. If the classifying attributive clause is omitted, the meaning of the sentence is changed or destroyed.
e.g. A disease in which abnormally large amounts of urine is excreted is called diabetes.
Complete the following complex sentences by filling the gaps with the correct classifying attributive clauses.