With April 18’s railway speedup,highway and air transport will have to compete with_______service for passengers.

Harry Potter stories are____both the teenagers and adults. 

—Does Bill do his new job well?—____ his old job. I’m afraid there’s no hope for him.

Lack food supplies and wanted by the police, the terrorists made a ______ attempt to hijack(劫持) a plane to Iran.

 After two years’ research, we now have a ____ better understanding of the disease.