—What worried him so much?—His hair is __________ grey.
He is very popular among his students as he always tries to make them ____ in his lectures.
With April 18’s railway speedup, highway and air transport will have to compete with ______ service for passengers.
John was dismissed last week because of his ______ attitude towards his job.
Since Tom ______ downloaded a virus into his computer, he can not open the file now.
Alan is a careful driver, but he drives ______ of my friends.