Lesson 15-the riddle of time II. Quiz 2 Fill in the blanks with the right forms of th 5. These prices are subject to variation words given (variable) 6. He signaled me to enter.(signal) 7. You will acquire immunity after the vaccination (immune) 8. He felt worried about the complexity of the problem(complex) W BTL E The end of Quiz 2Lesson 15—The Riddle of Time W B T L E II. Quiz 2 Fill in the blanks with the right forms of the words given. The end of Quiz 2. 5. These prices are subject to ________. (variable) 6. He ________ me to enter. (signal) 7. You will acquire ________ after the vaccination. (immune) 8. He felt worried about the _________ of the problem. (complex) variation signaled immunity complexity