C. they are stern and humorless. D. there is no one nearby to listen to them. E. their work makes them too tired to talk. B. Cowboys work alone. C. Cowboys are adequately paid.
Cowboys think of themselves as humorless.
B. an underground train. D. an exit ramp. E. a bicycle path. Practical Reading Regular tune-ups of your heating system will cut heating costs and will most likely increase the lifetime and safety of the system. When a service technician performs a tune-up, he or she should test the efficiency of your heating system.