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12. You...
B) have to

13. You ...
D) mustn't

34. Everybody...
B) has to

15. This is a secret. You...
D) mustn't

36. We...
D) must

37. If Robert wants to learn English, he...
C) should

38. The patients...
B) mustn't

39. Mr. Smith...
D) has to

40. When a teacher enters the room, all students...
D) have to

41. Sorry, I couldn't come yesterday. I...
B) had to

42. There is free parking for visitors. You...
A) haven't to

43. Sandra...
B) had to

44. Elnaz...
D) had to

45. The museum is free today. You...
C) don't have

46. Japanese children...
B) have to

47. You...
C) mustn't

48. Children...
A) haven't

49. Everybody...
A) have to

50. Asim...
C) has to