Ответы и объяснения

2014-02-07T10:38:56+04:00
3. 0.doesn't have to 1.has to 2.don't have to 3.don't have to 4. has to 5. doesn't have to
4. 0-mustn't 1-don't have to 2-doesn't have to 3-mustn't 4-don;t have to 5-mustn't