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Q41. He is ill at ease in his new position.
Q42. "Don't try to throw dust into my eyes. You will not succeed."
Q43. Don't mix with the bad hats.
Q44. All our effort ended in smoke.
Q45. The number increased by leaps and bounds.
Q46. To murder in "cold blood", it means to murder:
Q47. If somebody has worked for "donkey's years", it means he has worked:
Q48.  Replace the underlined portion with an idiom from the list below:
They finally agreed on the business deal. 
Q49. The idiomatic expression "A slap on the wrist" means:
Q50. He says he has invented a time machine, which is clearly a load of cobblers.