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