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Hoctap
2 năm trước
Hãy điền vào cụm từ thích hợp: a)............ là hợp chất mà phân tử gồm nguyên tử nguyên tố Ôxi liên kết nguyên tử nguyên tố khác ( Có công thức tổng quát dạng DxOy) b).......... là hợp chất mà phân tử gồm 1 hay nhiều nguyên tử Hiđrô liên kết với gốc Axit ( Có công thức tổng quát dạng: HnA) c).......... là hợp chất mà phân tử gồm 1 hay nhiều nguyên tử kim loại liên kết vói 1 hay nhiều gốc Axit ( Có công thực tổng quát dạng: RnAm)
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PASSIVE TO ACTIVE 1 Why don’t you have your eyes tested? (… get an optician to . . . See 119.) 2 This speed limit is to be introduced gradually. 3 The runways are being lengthened at all the main airports. 4 It is now 6 a.m. and at most of the hospitals in the country patients are being wakened with cups of tea. 5 Byron is said to have lived on vinegar and potatoes. 6 By tradition, any sturgeon that are caught by British ships must be offered to the Queen. 7 This notice has been altered. 8 The owners went away last March and since then their houseboat has been used continuously by squatters. (Use a continuous tense and omit continuously.) 9 The damaged ship was being towed into harbour when the towline broke. Exercise 2 10 Have a lift put in and then you won’t have to climb up all these stairs. 11 Last year a profit of two million pounds was made in the first six months but this was cancelled by a loss of seventeen million pounds which was made in the second six months. 12 Evening dress will be worn. 13 The ship was put into quarantine and passengers and crew were forbidden to land. 14 Someone will have to be found to take her place. 15 He was made to surrender his passport. 16 This rumour must have been started by our opponents. 17 My paintings are to be exhibited for the first time by New Arts Gallery. 18 This scientific theory has now been proved to be false. 19 The car which was blown over the cliff yesterday is to be salvaged today. various infinitive Exercise 3 20 The house where the dead man was found is being guarded by the police to prevent it from being entered and the evidence interfered with. 21 Why wasn’t the car either locked or put into the garage? 22 It is being said that too little money is being spent by the government on roads. 23 Your money could be put to good use instead of being left idle in the bank. 24 For a long time the earth was believed to be flat. 25 This copy hasn’t been read. The pages haven’t been cut. 26 The stones were thrown by a student, who was afterwards led away by the police. 27 Carrier pigeons are said to have been used by early Egyptian and Greek sailors. 28 The referee was being escorted from the football field by a strong police guard.

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