1. about / 30 km / my town / Ha Long Bay / .
2. my family / used / go / holiday / seaside / summer / .
3. how / long / it / take / you / Ha Noi / Sa Pa / .
4. there / used / be / a / factory / town centre / but / it / move / the / suburbs / .
5. you / must / learn / about / road safety / before / riding / your / bike / road /.