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A bolt from (or out of) the blue - A sudden and unexpected event. Cut the mustard - Come up to expectations; reach the required standard. This idiom does not fit in the context of the second sentence, which talks about the ill effects of air pollution. The lull (or calm) before the storm - A period of unusual tranquillity or stability that seems likely to presage difficult times. Only the first and third sentences use the idioms correctly. Option C is the right answer.
(6859.01)1/3 × 10.11 × 14.47 ÷ 20.32 = ? + 45.022
18.99% of (102.99 + 98.01) + 6.01³ - (9.02 of 2.99) = ? of (64.02 - 28.98)
75.01 + 344.923 - 179.93 = ?3 of (√678 + 3.89)
14.2% of 7200 + 2.8% of 6400 =?
? = (597.98 ÷ (6.97 2.01 – 3.1)) × 12.9
1025.08 + 1623.13 - 1784.91 + 2564.31 - 2897.98 = ?
(32.18% of 2399.89 - √624 × 26.25) % of 149.79 = ?
25.11 × 3.98 + 26.03 × 4.12 – 33.95 + 94.9 × 4.02 =?
(752.09 - 43.04 x 7.94) ÷ 16.9 = ?
1314.04 – 450.18 + 359.98 ÷ 12.06 = ?