Câu 2: Nitơ trong thiên nhiên là hỗn hợp gồm hai đồng vị là 𝑁714 (99,63%) và 𝑁715 (0,37%). Tính nguyên tử khối trung bình của nitơ?
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EXERCISES I. Put the verbs in brackets into the correct tenses. 1. If I see him, I (give) him a gift. 2. If I had a typewriter, I (type) it myself. 3. If I had known that you were in hospital, I (visit) you. 4. You could make better progress if you (attend) class regularly. 5. If I (know) his telephone number, I’d give it to you. II. Give the correct forms of the verbs in the parentheses. 1. She wishes her father (be) here now to help hen 2. I wish you (not give) them my phone number yesterday 3. I wish they (visit) us when they were in town. 4. I wish someone (give) me a job next month. 5. If only I (can take) the trip to Hanoi with her next summer. III. Use a phrase or clause of purpose to combine each pair of sentences below. 1. The boy stood on the benches. They wanted to get a better view. 2. We lower the volume of the radio. We don’t want to bother our neighbours. 3. I’ll write to you. I want you to know my decision soon. 4. These men were talking in whispers. They didn’t want anyone to hear their conversation. 5. The boy feigned to be sick. He hoped we didn’t make him work. IV. Use SO or SUCH. 1. The sun shone brightly that Maria had to put on her sunglasses. 2. Dean was a powerful swimmer that he always won the races. 3. There were few students registered that the class was cancelled. 4. We had wonderful memories of that place that we decided to return. 5. We had good a time at the party that we hated to leave. V. Supply either BECAUSE or BECAUSE OF as appropriate. 1. It was difficult to deliver the letter the sender had written the wrong address on the envelope. 2. We decided to leave early the party was boring. 3. Rescue attemps were temporarily halted the bad weather. 4. Paul may not go to the football game his grades. 5. They visited their friends often they enjoyed their company VI. Combine each pair of sentences below, using the conjunction given in parentheses. 1. He is very rich. He isn’t happy. (although) 2. He is very rich. He isn’t happy. (no matter) 3. She can’t answer my question. She is very intelligent. (although) 4. She can’t answer my question. She is very intelligent. (no matter) 5. He does anything. He is always careful. (whatever) VII. Supply the correct verb forms. 1. We would rather (stay) home tonight. 2. Mr Jones would rather (stay) home last night. 3. We would rather (drink) coffee than tea. 4. The photographer would rather that we (stand) closer together than we are standing. 5. Carmen would rather (cook) for the entire family.
''Cảnh mặt trời mọc ở quê hương tôi thật đẹp biết bao !'' hãy xác định chủ ngữ vị ngữ giúp mình với
Tính bằng cách hợp lí: 2021+2022+2023+2024+2025+2026+2027+2028+2029
giúp em mấy câu này với ạ , em cảm ơn
e) 2/7÷3/4 f) -3/7+9 g) -2/5-(-3)/7 h) (-2). -3/7 Ai k rõ bấm vào giúp e ạ
III. Supply the correct verb form: 1. She’s beautiful with a _____________ smile. (love) Giải thích đáp án: __________________________________________________ Dịch câu: ____________________________________________________________ 2. They spoke slowly enough for me (understand) _____________ them. Giải thích đáp án: __________________________________________________ Dịch câu: ___________________________________________________________ 3. _____________, the barber cut my hair too short. Giải thích đáp án: __________________________________________________ Dịch câu: ___________________________________________________________ 4. The room isn’t bright enough for you (read) _____________ books. Giải thích đáp án: __________________________________________________ Dịch câu: ___________________________________________________________ 5. They answered her questions fluently enough (get) __________ good marks from her. Giải thích đáp án: __________________________________________________ Dịch câu: ____________________________________________________________ 6. The teacher didn’t make the speech well enough for his students (understand) _____ it. Giải thích đáp án: __________________________________________________ Dịch câu: ____________________________________________________________ 7. An (orphanage) ____________ is a child whose parents are dead.Giải thích đáp án: Giải thích đáp án: __________________________________________________ Dịch câu: ___________________________________________________________ 8. Each of my friends has a _________ character. (differ) Giải thích đáp án: __________________________________________________ Dịch câu: ____________________________________________________________ 9. Nam is very ___________, kind and generous. (social) Giải thích đáp án: __________________________________________________ Dịch câu: ____________________________________________________________ 10. My uncle often spends his free time doing volunteer work at a local _______. (orphan) Giải thích đáp án: __________________________________________________ Dịch câu: ____________________________________________________________ IV. Use the correct preposition: 1. I received a letter __________ my Australian pen pal Mindy yesterday. Dịch câu: __________________________________________________________ 2. Nam is my close friend. I spend most of my time __________ him. Dịch câu: __________________________________________________________ 3. Are you tired ________ listening to her complaints? Dịch câu: ____________________________________________________________ 4. His friends don’t laugh _________ his joke. Dịch câu: ____________________________________________________________ 5. My Dad is loved because of his good sense _________ humor. Dịch câu: ____________________________________________________________ 6. I often spend my free time doing volunteer work _________ a local orphanage. Dịch câu: ____________________________________________________________ 7. He lives ________ 26 Tran Phu Street _________ Hanoi. Dịch câu: ____________________________________________________________ 8. His idea is quite different _________ mine. Dịch câu: ____________________________________________________________ 9. What does she look __________? Dịch câu: ____________________________________________________________ 10. Her family now is living peacefully __________ Hue. Dịch câu: ____________________________________________________________ giúp với ạ bài nhiều mong mọi người giúp em
3.Ngày 8/3, cửa hàng bán 5 bông hồng giá 75 000 đồng. Bố mua 15 bông hồng thì hết bao nhiêu tiền? (1 Point) 200 000 đồng 225 000 đồng 150 000 đồng 300 000 đồng 4.Mua 1 tá khăn mặt hết 96 000 đồng. Hỏi nếu cô Dung muốn mua 6 cái khăn mặt như thế thì phải trả người bán hàng bao nhiêu tiền? (Tóm tắt và giải chi tiết) (2 Points) Enter your answer 5.Có 100 quả táo xếp đều vào 20 khay. Hỏi xếp 9 khay như thế cần bớt đi bao nhiêu quả táo? (1 Point) 180 quả táo 20 quả táo 900 quả táo 45 quả táo 6.Một ô tô đi trong 1/2 giờ được 21 km. Hỏi nếu ô tô đi trong 2 giờ thì được quãng đường dài bao nhiêu ki -lô -mét? (Tóm tắt và giải chi tiết) (2 Points) Enter your answer 7.Mua 5m dây điện phải trả 90 000 đồng. Hỏi mua 45 m dây điện như thế phải trả bao nhiêu tiền? (chỉ điền kết quả: ... đồng) (1 Point) Enter your answer 8.May 15 bộ quần áo như nhau hết 45 m vải. Hỏi may 25 bộ như thế hết bao nhiêu mét vải? (Chọn đáp án đúng nhất) (1 Point) 70 m vải 75 m vải 65 m vải 85 m vải 9.Mua 4 hộp sữa hết 100 000 đồng. Hỏi mua hai chục hộp sữa như thế hết bao nhiêu tiền? (1 Point) 280 000 đồng 200 000 đồng 250 000 đồng 500 000 đồng 10.Một ô tô cứ đi 100 km thì tiêu thụ hết 13 lít xăng. Nếu ô tô đó đi quãng đường 300 km thì tiêu thụ hết bao nhiêu lít xăng? (nhập câu trả lời dạng .... lít xăng)Immersive Reader (1 Point)
Giúp mik với TT_TT ai nhanh nhất và đúng nhất mik cho 5* ;-;
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