51.A. Then B. Yet C. However D. Therefore
50.A. lately B. finally C. especially D. fortunately
49.A. orders B. goods C. books D. answers
48.A. Guests B. Assistants C. Managers D. Customers
47. A. putting up B. picking up C. setting up D. looking up
46.A. nervous B. lucky C. equal D. eager
45.A. suitably B. cheaply C. simply D. hardly
44.A. shop B. wait C. turn D. deliver
43.A. until B. since C. if D. while
42.A. see B. watch C. let D. notice