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Bài 1. Tìm A U B U C, A ∩ B ∩ C và biểu diễn chúng trên trục số a. A = [1; 4], B = (2; 6), C = (1; 2) b. A = (–∞; –2], B = [3; +∞), C = (0; 4)
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Exercise 1 : Give the correct form of the words 1.I (be)....................................... a student 2 years ago. 2.(Be)................. you a teacher two years ago? Yes, I (be)................. 3.Where (be).................... Nam from yesterday? 4.The Olympic (start)……………………….in 1990. 5.When my brother (be) ……………………… at grade 6, he (take)………………… part in a marathon at school and (win) ……….... the gold medal 6.Nam (return) .............................to Ha Noi last week? 7.I (go)............................to Ben Thanh market last Monday 8.He (get)..............................up at 7 o’clock yesterday. 9.What time you (go) .....................to bed last night? 10.She ( not go)..................................to work last weekend. 11.Lan (meet).................................her at the party 3 years ago. 12.Last summer vacation, Mom (not buy).............................me a new buy? 13.When he (leave)............................... for work last week. 14. Yesterday, we (go)…………… to My Dinh stadium and (watch) …………… a friendly football match between Vietnam and Indonesia. 15. The Olympic (start)……………………….in 1990.

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