If you are old enough to work you can try to find a job in the customer service sector, like cashier and such ^^
And read books, watch TV, talk to people in English
And if you are still in school/college/university, avoid speaking Chinese too much
Although, if you are young (i.e. emigrated from China before Gr.9), you should practise Chinese once in a while or else you might forget it (like me =_=)
努力哦~多倫多的中國人很多的說*coughPacificMallcough*
