81. Look at the sky, it is going to rain. Thus, you must bring along a raincoat. A B C D 82. I ought to go home now because I don't want to walk in the dark. A B C D 83. As our teacher said yesterday, we ought to not worry about the mid-term test. Take it easy. A B C D 84. This competition is optional, so we not have to take part in it. A B C D 85. Despite having a little chance to win, you should give up your dream of becoming a star. A B C D 86. The professor told me that we should give this assignment in by Thursday at the latest. A B C D 87. What you should do now is to make slides for the presentation tomorrow as we have a little time left. A B C D 88. You have to apply for this position as soon as possible since it has only three vacancies. A B C D 89. Ms. Anna will give a fascinating lecture at 8 a.m., so you should be here at 7.45 to check in. A B C D 90. My advice is you have to consider carefully before making the final decision. A B C D