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

The noise was so _____ that only those with excellent hearing were aware of it.

For our middle school students, some courses are compulsory, while others are ________.

—You know our manager has been in hospital for days?— Yes. I wonder if he is ____ better now. 

 ---What do you think of the world-famous football player Messi from Argentina?---I've never seen ______ one before. He was born to play football.