填空题

Albert White is a driver on the London Underground. In order to be at work by 5 a. m. , he might have to get up (11) 4 a. m. Trains leave about every ten minutes up to about 7 a. m. He finds the work quite (12) because he has to stay alert all the time since there are only 2 or 3 minutes between each station. His work is (13) because there is a (14) air ’and there is stress on the nerves. However, being one’s own boss and good (15) are the advantages of the work.