He goes to school by bus, but he walks ______after school.

 — _____ do you learn English?  — By listening to tapes and reading aloud．

The box is ______heavy  for the girl ____carry .

--- ___________ is it from Suzhou to Beijing?--- It used to be a long way, but nowadays, it takes only five hours to get there by high-speed rail.

-- ____ __ have you been at this factory? -- Since 2000.