71. Thu told that he wasn't not good at speaking English.
72. Because of the polluted water, we can't swim in this river.
73. Since I am sick, I don't want to go out now.
74. That is the teacher who used to teach me when I lived in the town.
76. If she prepares carefully, she will do the test well.
77. If they support actively, we can finish the research perfectly.
78. If you work hard, you can pass the examination.
79. If she uses energy-saving bulb, she can save money.
80. It is very important to keep the environment clean.
81. Although English is not easy, I like to study it.
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