—Your watch is so beautiful. It must be expensive.—Not at all. I only ¥20 on it. A. cost B. spent C. paid
—Do you go there by bike ________ by bus? —By bike.
What do you ________ the workers in the factory?
—________ do you usually go to school,Simon? —By bike.
Do you know ________?
In China,some of the students ________ the river to school by ropeway. A.live B.drive C.cross