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longdz
2 năm trước
Có thể hòa tan được các dung dịch sau không? (Phải hòa tan những muối nào, bao nhiêu mol): b. Dd B chứa: 0,01 mol Ba2+; 0,04 mol Al3+; 0,06 mol NO3–; 0,08 mol Cl–
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. Choose the best word/words in brackets 1. My friend.........................to the museum last weekend. (goes, went, had gone) 2. My grandfather.............................many years ago. (dies, died, has died, was dying) 3. I.......................my son the money for that last week. (gave, given, have given, was given) 4. The earth.........................around the sun. (go, went, has gone, goes) 5. He ...........her walk through the park two hours ago. (sees, saw / has seen) Ex 3. Supply the correct tense form of the verbs in brackets 1. She usually....................................dinner for the family. (cook) 2. They..............................their mother with the housework everyday. (help) 3. Mr. Brown.........................................in Birmingham ten years ago. (live) 4. There....................traffic jam in the center of the city almost last year. (be) 5. The students........................................the final test every month. (have) 6. They.........................................those interesting books yesterday. (read) 7. Lan...........................some flowers for her teacher last Sunday. (buy) 8. The Pikes....................................dinner last night. (have) 9. He ............................................... this book for children last year. (write) 10. She......................................Bangkok two years ago. (visit)

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