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trumnho
2 năm trước
1.Một cốc thuỷ tinh chứa 200ml dung dịch AlCl3 0,2M. Cho từ từ vào cốc V ml dung dịch NaOH 0,5M. Tính khối lượng kết tủa nhỏ nhất khi V biến thiên trong đoạn 200ml £ V £ 280ml. A. 1,56g B. 3,12g C. 2,6g D. 0,0g giúp em với ạ
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IV)-Put the verb in brackets into the Past Simple or Past Progressive tense. 1. When my uncle (come)__________, we (water)__________ the plants and flowers in the garden. 2. Thu (talk)____________ to her friend, Hoa, on the phone at 8 o’clock last night. 3. Lan (practise)____________ the piano while her sister (read)_____________ comics at 7 o’clock last night. 4. The monkeys (climb)____________ up the trees when we (visit)___________ to zoo yesterday morning. 5. Ba (talk)___________ with his classmate when the principal (enter)___________ their classroom. 6. Last night I (make)__________ a cake when the lights (go)____________ out. 7. While I (cross)____________ the street, I (step)____________ on a banana skin and (fall)_____________ heavily. 8. It (begin)____________ to rain when I (plant)___________ some flowers in the garden. 9. When I (arrive)_____________, the teacher (write)____________ on the blackboard. 10. When they (walk)______________ down the stairs, they (hear)____________ a strange noise. V)-Complete the sentences with verbs in brackets in the past continuous. Last Saturday, we were very busy. In the morning, … 1. I (do)_____________ my homework. 2. my parents (shop)____________. 3. my sister (chat)_____________ to her friends online. 4. my grandparents (drive)____________ to our house. At two o’clock in the afternoon, … 5. I (make)________________ tea for everyone. 6. my sister and my mum (cook)_______________ dinner. 7. my grandmother (sleep)_____________ in front of the TV. At five o’clock in the afternoon, … 8. we (have)____________ a snack. At six o’clock in the evening, … 9. my parents and my grandmother (drink)_________________ tea. 10. my grandfather (try)_______________ to send an e-mail on my computer. VI)-Read the following fable and put the verbs in brackets into the past simple or the past continuous. The Woodcutter and his Axe One day, a woodcutter (1. cut)__________ a tree on the bank of the river when his axe (2. slip)____________ from his hands and (3. fall)_____________ into the water. The poor man (4. be)_____________ so sad that he (5. start)______________ to cry bitterly. At this moment, and angel (6. appear)__________ there and (7. ask)__________ the woodcutter why he (8. cry)____________. He (9. tell)______________ the story, and the angel (10. feel)_____________ sorry and (11. drive)_______________ into the river to find the lost axe. Later, he (12. appear)_________ from the water with a gold axe in his hand, but the woodcutter (13. refuse)__________ to take it, saying that it (14. not be)____________ his axe. The angel (15. drive)___________ into the water once again and (16. appear)____________ with an axe that was made of silver. The woodcutter (17. be)____________ still sad. He (18. shake)___________ his head harder and (19. tell)______________ the angle that his own axe (20. be)____________ made of iron. The third time the angel (21. come)__________ out of the water with an iron axe in his hand. Filled with joy, the woodcutter (22. cry)___________, “This belong to me”. He (23. thank)_____________ the angel for helping him. The angel (24. be) ______________ greatly impressed by his honestly, and he (25. give)______________ the woodcutter the other two axes as a reward for his honestly. ( gấp nha :> )

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