1. 1) on 2) in 3) by car for 4) at 5) at

2. 1) The train is faster than the taxi

2) The train is smaller than the taxi

3) The train is cheaper than the taxi

4) The train is more comfortable than the taxi

3. 1) didn't go 2) Do you fly 3) went 4) didn't buy 5) Does Sam write