1. illegal

2. traffic jam

3. seatbelt

4. safely

5. railway station

6. safety

7. traffic signs

8. helicopter

9. tricycle

10. boat

Câu 9:  D

Câu10: D

Câu11: A

Câu12: C

Câu13: Không hình nào có tâm đối xứng

\(\#PeaGea\)

Câu 13 : Đáp án D

Câu 14 : Số phân tử $CO_2$ = $1,5.6.10^{23} = 9.10^{23}$ phân tử. Đáp án B

Câu 15 : Ta có $M_{hợp\ chất} = 1X + 3O = 1X + 16.3 = 2,5M_{O_2} = 2,5.32 = 80$ Suy ra X = 32. Vậy X là nguyên tố Lưu huỳnh. Đáp án B

\(13,PTHH:N_2+3H_2\rightarrow2NH_3\\ \rightarrow Chọn.D\)

\(14,Số.phân.tử.là:n.6.10^{23}=1,5.10^{23}=9.10^{23}\\ \Rightarrow Chọn.B\)

\(15,PTK_{h.c}=32.2,5=80\left(đvC\right)\\ CTHH.có.dạng:XO_3\\ \Leftrightarrow X+3.16=80\\ \Leftrightarrow X=32\left(đvC\right)\\ \Rightarrow X.là.S\left(lưu.huỳnh\right)\\ \Rightarrow Chon.B\)

a. \(\sqrt{12^2}\)

= 12

b. \(\sqrt{\left(-7\right)^2}\)

= 7

c. \(\sqrt{\left(2-\sqrt{5}\right)^2}\)

= 2 - \(\sqrt{5}\)

ở đây không phân biệt giỏi hay dốt cả bn nha

g: Ta có: \(\sqrt{7+4\sqrt{3}}-\sqrt{7-4\sqrt{3}}\)

\(=2+\sqrt{3}+2-\sqrt{3}\)

=4

j: Ta có: \(\sqrt{4-2\sqrt{3}}+\sqrt{4+2\sqrt{3}}\)

\(=\sqrt{3}-1+\sqrt{3}+1\)

\(=2\sqrt{3}\)

15 They said they would go to the beach if the weather was nice the day after (loại 1)

16 I told Mike Halen would know what to do if she were late (2)

17 Mark said he would have spoken to Frank if he had seen him the day before (3)

18 The girl said he wouldn't run away if she saw a spider (2)

19 David told her if she had too much to do, she could ask him to help her (2)

20 He told me if I studied harder, I would get high marks in next exam (1)

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chụp mờ quá

22. satisfied

23. considerate

24. generosity

25. proud

26. activist

27. generously

28. proud

29. unpolluted

30. preventing

31. Environmentalists

32. disappointing

33. complaint

34. conservation

35. disappointingly

36. environmentalists

37. unpolluted

38. Preventing

39. complaint

conservationists

considering

polluting