17. Many parents find it difficult ……….. with their teenage children. A. to communicate B. communicate C. communicating D. communicates 18. Communication ……… significantly for ten years. A. changed B. has changed C. have changed D. change IV. Circle the letter A, B, C or D that needs CORRECTION. 19. At 11 A.M yesterday, he will be having a video conference with his colleagues in A B C D America. 20. When you arrive at the airport, we will wait at Gate 5 A B C D

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