Bài 3. Cho tam giác ABC, các đường cao AD, BE, CF, trực tâm H. Gọi O là giao điểm ba đường trung trực. Gọi I là trung điểm AH. Qua 1 kẻ đường thẳng vuông góc với OI, cắt AB,AC tại K, L. a) Gọi M là trung điểm của BC, chứng minh AH = 2OM b) Chung minh MH vuông góc KL . c) Chứng minh AHCM đồng dạng với AKAI, từ đó suy ra IK = IL

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Question 16. Linh and Long used to _____ their bikes in his spare time.
A. ride B. rides C. riding D. rode
Question 17. We like the film very much. The _____ are amazing and the plot is gripping/
A. characters B. acting C. styles D. action
Question 18. The _____ is incredible. The robots named Optimus and Bumblebee look so real.
A. music B. sound track C. special effects D. lighting
Question 19. _____ the plot was well written, I didn’t like that acting.
A. Because B. Although C. In spite of D. However
Question 20. The film was directed by one famous director. _____, it wasn’t a big success.
A. Although B. In spite of C. When D. Nevertheless
Question 21. Mr. Dam is a _____ person because he believes much in his star sign.
A. superstitious B. careful C. traditional D. smart
Question 22. _____ is this Festival held? Every 2 years.
A. How long B. Why C. How often D. Who