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Commenting on the UK's future in the EU, Mrs Merkel said: "We would very much like to have the UK in a strong and successful Europe."   On migrants' abuse of benefits, she said: "Abuse needs to be fought against so freedom of movement can prevail."   The German chancellor declined to comment about whether she would support or oppose any of the changes being sought by Mr Cameron.  The prime minister earlier accompanied Mrs Merkel to an exhibition on the history of Germany at the British Museum.  The five-hour visit, one of a number Mrs Merkel is making to world leaders as part of Germany's year-long presidency of the G7 group of nations, is likely to be her last to the UK before May's general election.   Mr Cameron has called for a far-reaching shake-up of welfare and employment rules across the EU, including requiring migrants to have a job offer before coming to the UK, making them wait four years before they can receive certain benefits and ending the payment of child benefit to dependents of EU migrants overseas.  He has said the proposals will, in some cases, require changes to existing treaties and therefore require the support of all 28 members - most of whom have said they are fundamentally opposed to anything will infringing the principle of the freedom of movement across the EU.  In a joint statement earlier, the two leaders said their talks would focus on tackling instability in the global economy and securing long-term growth, including the prospect of a trade deal between the EU and US.