What’s the expression?

{"params":{"content":{"task":"<p>Replace the phrases in bold with a \u201cwork\u201d expression.<\/p>\n","blanksList":[{"correctAnswerText":"works wonders"},{"correctAnswerText":"work out\/work out OK"},{"correctAnswerText":"work out\/do a work-out"},{"correctAnswerText":"all in a day\u2019s work"},{"correctAnswerText":"have their work cut out"},{"correctAnswerText":"work out"}],"blanksText":"<p>A. If you want to clean silver, use lemon juice. It <strong>produces very good results<\/strong>.<br>\n\u2192 If you want to clean silver, use lemon juice. It __________ .<br>\nB. Don\u2019t worry about the wedding. I\u2019m sure it\u2019ll all <strong>be OK<\/strong>.<br>\n\u2192 Don\u2019t worry about the wedding. I\u2019m sure it\u2019ll all __________ .<br>\nC. I\u2019m going to the sports centre to <strong>do some intensive exercise<\/strong>.<br>\n\u2192 I\u2019m going to the sports centre to __________ .<br>\nD. In customer service, dealing with difficult people is<strong> a normal part of the job<\/strong>.<br>\n\u2192 In customer service, dealing with difficult people is __________ .<br>\nE. They <strong>have lots to do<\/strong> if they want to finish the project by Friday.<br>\n\u2192 They __________ if they want to finish the project by Friday.<br>\nF. It took me days to <strong>understand<\/strong> how to use the new software.<br>\n\u2192 It took me days to __________ how to use the new software.<\/p>\n"},"overallFeedback":[{"from":0,"to":100}],"behaviour":{"mode":"typing","selectAlternatives":"alternatives","selectAlternativeRestriction":5,"spellingErrorBehaviour":"warn","caseSensitive":false,"autoCheck":false,"enableSolutionsButton":true,"showSolutionsRequiresInput":false,"enableRetry":true,"enableCheckButton":true,"disableImageZooming":false,"confirmCheckDialog":false,"confirmRetryDialog":false},"showSolutions":"L\u00f6sung anzeigen","tryAgain":"Wiederholen","checkAnswer":"\u00dcberpr\u00fcfen","notFilledOut":"Bitte f\u00fclle alle L\u00fccken aus, um die L\u00f6sung zu sehen","tipLabel":"Tipp","spellingMistakeWarning":"\u00dcberpr\u00fcfen Sie die Rechtschreibung: @mistake","scoreBarLabel":"Du hast :num von :total Punkten erreicht.","confirmCheck":{"header":"Beenden?","body":"Ganz sicher beenden?","cancelLabel":"Abbrechen","confirmLabel":"Beenden"},"confirmRetry":{"header":"Wiederholen?","body":"Ganz sicher wiederholen?","cancelLabel":"Abbrechen","confirmLabel":"Best\u00e4tigen"}},"metadata":{"title":"What\u2019s the expression?","license":"U"}},