6. I'll only help you if you promise to try harder. - Unless 7. Unless someone has a key, we can get into the house. - If. 8. World population will continue to rise if we do not try to reduce it. - Unless 9. You will catch a cold if you don't keep your feet dry. - Unless 10. This tree won't grow if there is no water. - Unless 11.If you close the window, the room will not be cold. > Should. 12.If he is free, he will come to visit me. >Should. 13. If she ate too much. She would be over weight → Were.... 14. If Peter were late, he would be punished. > Were.... 15.He will catch the first bus, he will come on time. > Should... 16.I don't know her email address, so I can't tell you If.. 17.I can't play football this afternoon because I feel tired >If 18.She work in the morning. She has no time to watch TV >If 19.He doesn't have a watch. He's always late for work >Were 20.1 am not tall, so I can't join the basketball team. >Were... 21. Jack was late the party because his watch was 5 minutes slow >If.. 22.Sam didn't know the highway was closed, so he didn't take anoth >Had. 23. Because I lost my key, I had to wait my roommate Unless 24. We are tired today because we went to bed late last night >If. 25.I didn't know you were in hospital. I didn't visit you

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