71. “The sphinx riddle” means:

• A joke
• A mysterious puzzle
• A simple question
• A dangerous story

72. Among the idioms starting with S, the idiom “A sine qua non” means:

• Something optional
• Something non-serious
• Something absolutely necessary
• Something enjoyable

73. “Status quo” means:

• Change the current state
• Accept a new condition
• Maintain the present condition
• Reject past events

74. “A brown study” means:

• Studying seriously
• Feeling sleepy
• A gloomy or dreamy mood
• Reading with joy

75. Among the idioms starting with S, the idiom “Sweat of one’s brow” means:

• Easy work
• Physical injury
• Hard labour
• Playing sports

76. “A standing dish” means:

• A favorite dessert
• A food served daily
• A main course
• A dish served on holidays

77. “Swan song” means:

• A sad song
• A beginning performance
• A farewell speech
• A final creative work

78. Among the idioms starting with S, the idiom Spick and span means:

• Old and dusty
• Neat and clean
• Full of color
• Brand new but dirty

79. See eye to eye means:

• To dislike someone strongly
• To agree completely
• To stare at someone
• To challenge authority