Hỗn hợp X gồm Fe₂O₃ và CuO dùng H₂ để khử hoàn toàn 32g X phản ứng thu được 24g hỗn hợp chắt rắn Y. Hãy cho biết:

1. Phần trăm khối lượng mỗi chất trong X và Y.

2. Thể tích H₂ cần dùng ở đktc.

3. Khối lượng dung dịch 14,6 phần trăm cần lấy để phản ứng hết với Y

Give the correct form of the verbs in brackets

4. It's much better( stay) ............... at home than to go out in the rain.

18, Is there anything here worth (buy) ..............?

2, The principal tells him ( come) .............. in.

6, You'll be able ( do ) ..................... it yourself when you are older.

12, My family is considering( take) .............. a trip to the USE next year

14, we don't allow people( smoke) .................... in the lecture room.

21. The teacher recommends us ( prepare) .............. the lessons well before ( came) ........... to class.

22. There are people can't help ) laugh) ........ when they see someone ( slip ) .............. on a banana skin.

28. the teller was made ( raise) .............. his hands.

31. When the rainy season comes, you need ( repair) ....... the roof of the house.

32. The flowers need ( water) ................. but you needn't (water) .............. them now.

\(Change\) these sentences into passive voice

1. They make these artificial flowers of silk

.............................................

2, he has spelt this word wrongly

................................................

3, How do people learn English.?

..................................................

4, who loooked after the children when you were away?

................................................................

5, they used to drink beet for breakfast in England years ago.

......................................................................

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