Computers can work out maths problems ---- than we do.

Computers can work out maths problems ____ than we do.A)much quickly B)more quick C)even quicker D)far more quicklyWhen I got to the station,the train ____already.A)had left B)has left当他到站了,发现包掉在车上是用leave还是forget?It _____ too much.A)spends B)takes C)costs D)pays