The Convention for the Rights of Persons with Disabilities__________into force on 3 May 2008., come, came, were coming, had come, Maria_____20 interesting stories for students with reading difficulties since she visited the special school., was recorded, recorded, record, has recored, In Singapore the Convention_______into effect since August 2013, has come, had come, came, come, Kevin________never______at a school for students with disabilities., was never volunteered, has never volunteer, has never volunteered, was never volunteer, Thomas Edison (1847-1931, one of the world's greates inventors,________difficulty with words and speech., had, have, have been, had been, So far Nam______two of the organisation's campaigns., was supported, support, has supported, supported

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