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EXERCISE Choose the best verb or noun from the chart to complete each sentence. Remember to use the correct verb tenses and singular or plural noun forms. 1) In the 19th century, parents realized that they had to take care of their children’s health and try to give them a good . Before that, most people did not go to school. 2) The . of the world is increasing every year. In the year 2005 there will be at least 7.2 billion people on the earth. 3) When people in North America . themselves to you for the first. | UNIT 4 IMBALACES 29 EXERCISE Choose the best verb or noun from the chart to complete each sentence. Remember to use the correct verb tenses and singular or plural noun forms. 1 In the 19th century parents realized that they had to take care of their children s health and try to give them a good.Before that most people did not go to school. 2 The. of the world is increasing every year. In the year 2005 there will be at least 7.2 billion people on the earth. 3 When people in North America.themselves to you for the first time they usually say Nice to meet you and shake your hand. 4 Some scientists think that drinking green tea is good for your health. In fact some people think it helps. diseases. 5 The island of Puerto Rico. a lot of sugarcane. The sugar that comes from it is sold all over the world. 6 After World War II Germany was divided into two separate countries. However this. did not last. In 1990 the two Germanies united as one country again. 7 Many centuries ago people left their countries to search for new lands. The . of the new world brought people from many countries together in North America. 8 If you have a question when you are in the library go to the . desk and ask one of the librarians for help. STRUCTURE STUDY RELATIVE CLAUSES A noun can be modified by a clause. A clause of this kind is begun by a relative pronoun and called a relative clause. It always follows the noun which it modifies and which is known as its antecedent. Look at the following sentences a An engineer is a skilled person. He designs builds or maintains engines machines bridges railways etc. b An engineer is a skilled person who designs builds or maintains engines machines bridges railways etc. 30 ENGLISH FOR ENVIRONMENTAL STUDIES The relative pronouns are Subject who which that Object who whom which that 0 Possessive Determiner whose a noun Adverbial when where why when and why can be replaced by that or 0 EXERCISE 1 Join each pair of sentences making the second sentence a .