I have to go to school on foot while my bike ____.
A.is repaired B.is to be repaired C.will be repaired D.is being repaired The number of people going to the cimema is ___gradually due to the expensive tickets. A.reduce B.decrease C.increase D.dwindle We'd like to ___a table for five for dinner this evening. A.preserve B.reserve C.retain D.sustain 请说明选择理由