1) My mum said: "you..... be here back home at 10 a) can b) must c) could 2) I.... swim very well  a) can  b) must  c) had 3) when I was young.....to write very fast  a) must b) can c) I was able  4) I....be at the restaurant at 10 for my birthday's party a) can b) must  c) was able  5) I....do this exercise. it is so difficult  a) like  b) mustn't c) can't 6) for an healthy diet I... drink 2 litres of water a) can b) must c) could

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