51. If you see a fire in Cambridge, you should dial _________.

A. 023-1500        B. 846-1212       C. 645-1212        D. 876-5800

49．A．think            B．worry about      C．wait         D．take care of

48．A．easy             B．wrong          C．right         D．simple

47．A．talk to           B．speak           C．tell          D．say

46．A．rather than        B．even though     C．as           D．or

45．A．number          B．idea            C．seat         D．trip

44．A．running          B．walking        C．driving       D．travelling

43．A．something        B．nothing        C．anything      D．everything

42．A．cheap            B．expensive      C．interesting    D．lonely