________ take a bus, I would walk to school.
Mary _______ have arrived ten minutes earlier but her flight was held up because of the heavy fog.
________ you have learned should be made good use of ________ making mistakes in the coming college entrance exam.
I plan to move to the countryside as the air there is much fresher than________ in the city.
If ________ into English, the sentence will have a totally different word order from Chinese.
Hardly ________ stepped on the stage when the audience broke into thunderous applause.