Tom, ______ yourself .Did you forget the school rules?
| A．behave | B．believe | C．perform | D．conduct |
48. They were all tired, but _____ of them would stop to take a rest.
| A．any | B．some | C．none | D．neither |
49. I don’t know whether small oranges are sweeter than big ______.
| A．those | B．ones | C．one | D．that |
50. When they met, they stopped and said hello to_______.
| A．each other | B．each another | C．the other each | D．each one |
51. After everyone took_______ place, the meeting began.
| A．his | B．their | C．there | D．the |
52. －Why don’t we take a little break?
－Didn’t we just have _______?
| A．it | B．that | C．one | D．this |