51. 还有自然室。There is Natural History room ______ ______.

50.______ ______ _____(注意) the difference between the two museums.

49. It’s ______ ______ _______.(违反规定的)

48. It’s ____ ____有点 familiar.

47.Betty is going ____ ____ _____独自 to the museum.

46. They are ________ ___________ ____ 盼望__________参观the museum.

45. I think ______ ______(一天) we’ll travel to the moon .

44. I’d like a hamburger _______ ______ (而不是)a piece of bread.

43. Clothes made _____ ______ (手工)are usually very expensive.

42. _____ _____ ______,(因此) they were expensive and rare.