Choose the best option to complete these sentences

1.(How far/ How long/ How) is it from your house to the nearest bus station?

2.My brother (used/ use to/ used to) walk to school when he was in primary school. Now he cycles.

3.Before the new system of traffic control, there (used to/ is used to/ was used to) be more accidents.

4.Traffic accidents can be prevented if people (take care of/ remember/ obey) the rules.

5.Slow down a bit. There's a 50km (driving license/ zebra crossing/ speed limit) on this road.