56. is

57. drove

58. could

59. have

60. ate

61. knew

62. traveled

63. we do

64. to be

65. were waiting

66. had gone ... wouldn't have been

67. are

68. smoking

69. always leaves

70. to study

71. haven't spoken

72. arrive

IV.

1. I'm looking forward to the upcoming pottery workshop.

2. The pop star was invited to the chat show, but he didn't arrive

3. THe teacher asked him to go out because he misbehaved in the class.

60. ate

61. knew

62. traveled

63. i do

64. to be

65. have been waiting

66. go/ won't be

67. were

68. smoking

69. always leaves

70. to study

71. haven'n spoken

72. arrive