Tính:

(1/2^2-1).(1/3^2-1). ... .(1/100^2-1)

Practise:Give the corret form of the verb 1. I (know) Anderson since we (study) in Moscow ten years ago. 2. A friend of my brother’s (call) him last night, but he (not be) at home. So I (take) a message. 3. When I first (come) here, it ( be ) a very quiet area. But since then everything (change). 4. We (wake) up by the bell (ring) 5. We just (see) the head teacher (correct) our papers in the room. 6. Their father (drive) to work today. He (not travel) by bus. 7. We (take) to that restaurant 2 years ago but since then nobody (take) us there. 8. Now a lot of nice paintings (display) in the art gallery. You (be) there yet? 9. Why you (make) so much noise in your room, Mike? We (rehearse) a new play. 10. My sister (practice) (play) the violin at the club twice a week.

8. Hoi An is a tourist…. A. attractive ​B. attracted ​ C. attract ​D.attraction