Test for Unit 9, Book2I. Vocabulary (20%)Directions: Fill in each of the blanks in the following sentences with a correct preposition or adverb and write down your answers on your Answer Sheet.1. In 1965, the last year _ which the old national origins system was fully in effect, Mexico, and Great Britain headed the list of countries sending immigrants to the United States.2. A more open attitude _ new arrivals has been adopted.3. A limit of 170,000 immigrant visas per year for
