Mn giúp mình với ạ Chứng minh: A ∩ B ⊂ A ⊂ A ∪ B

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EX 1 : Present perfect 1. We _________________(be) to the pagoda many times. 2. My sister ___________________ (go)out . 3. We ______________ (be)very busy lately. 4. Our present teacher ____________________ (live)in this city all of his life 5. I _____________________ (never/see) that television program 6. We _____________________ (fly) to Hanoi twice since last summer 7. John _______________________ (just/finish) his assignment 8. I _________________________(not/see) your brother recently 9. I’m very tired. I _____________________ (drive) this car since 7a.m 10. You ____________________ (just/meet)her – if you hurry, you will catch her in the street 11. This is the nicest restaurant I ________________ (see) 12. I ______________________ (write) three letters already 13. This is the fourth time he _________________________ (damage) my car 14. ______________________________ (you ever eat) Chinese food? 15. She’s got the best voice I ______________________ (ever hear) Ex 2 : Past simple 1. I (go)............................to Ben Thanh market last Monday 2. He (get)..............................up at 7 o’clock yesterday. 3. What time you (go) .....................to bed last night? 4. She ( not go)..................................to work last weekend. 5. Lan (meet).................................her at the party 3 years ago. 6. Last summer vacation, Mom (not buy).............................me a new buy? 7. When he (leave)............................... for work last week. 8. What you (do)................................. yesterday? 9. We (begin)....................................to learn English 3 years ago. 10. She (be).........................................an engineer last week.