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1. The underlined part that needs correcting is B: clean → are cleaning Corrected sentence: Listen! The students are cleaning the classroom right now. 2. The underlined part that needs correcting is B: likes → like Corrected sentence: Does she like watching science fiction films in her free time? 3. The underlined part that needs correcting is C: but →, (the comma is necessary for a more grammatically correct sentence, though the error could be argued as the comma or the conjunction 'but' in the position, and the correct usage may be, "Although the weather was cold, they still went camping last weekend.") 4. The underlined part that needs correcting is B: a → the Corrected sentence: We visited the Eiffel Tower during our trip to France. C. People will have flying cars in the future.