We have been in No. 7 Middle School ____ three years. A. since B. in C. for
—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