12. Lan hasnt written to Maryam for a month. It is a month since ... 13. "I won't help you with your homework. Never! Katarina said to me. Katarina refused ................ 14. It is a long time since we last met. => We haven't........................................................................ 15. My father had watered all the plants in the garden by the time my mother came home. => Before .............................................................................. 16. The students have discussed the pollution problems since last week. => The pollution problems..................................................... 17. He loses his job because he is late every day. => If....................................................................................... 18. Ill call the police if you dont leave me alone. => Unless...............................................................................