Write the sentences using (not) as ... as.

1 these blue seats / not be / comfortable / those red ones
 - These blue seats aren’t as comfortable as those red ones.
2 the bus / not be / fast / the car
3 the temperature on the bus / be / high / the temperature outside
4 these plane tickets / be / expensive / those train tickets
5 travelling alone / not be / safe / travelling in a group