71. Unless you give me back my bicycle, I will call the police.
72. If you don't hurry up, you will be late for the concert.
73. If it doesn't stop raining, we won't go out.
74. The wedding car was decorated with ribbons and flowers.
75. The Internet is used as a means of education.
76. He couldn't meet you because he was busy.
77. He likes her because of her beauty.
78. Many people sell food on the sidewalk.
79. The work can't be finished unless you help us.
80. Your job will be lost if you go to work late again.