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losing weight B. to lose weight C. to keep weight D. to gain weight 4, Since your brother is in trouble, you ______ give him a hand. A. need B. could C. might D. should 5, Let’s go to a movie after work, OK? — _____________ A. Not at all. B. Why not? C. Never mind. D. What of it? 6, I was really anxious about you. You _______ home without a word next time. A. mustn’t leave B. shouldn’t have left C. couldn’t have left D. needn’t leave 7, Black holes _____ not be seen directly, so determining the number of them is a tough task. A. can B. should C. must D. Need 8, I think he could have joined us, but he ____ A. doesn39。t D. couldn39。 t have visited D. shouldn39。t you? No officer, I ____. This car doesn39。t have been C. mustn39。t have been 11, Where is Jack? I can’t find him anywhere. He ______ his homework upstairs. A. might have done B. must have done C. might be doing D. must do 12, Mr. White _____ at 8:30 for the meeting, but he didn’t show up. A. should have arrived B. should arrive C. should have had arrived D. should be arriving 13, We _____ last night, but we went to the concert instead. A. must have studied B. might study C. should have studied D. would study 14, No potatoes for me—I’m _______ a diet. A. at B. in