1．If the fire alarm is sounded, all residents are requested to _____ in the courtyard.
　　A．converge
　　B．assemble
　　C．crowd
　　D．accumulate
　　2．If the United States had built more homes for poor people in 1995, the housing problems now in some parts of the country _____ so serious.
　　A．wouldn't be
　　B．wouldn't have been
　　C．will not be
　　D．would have not been
　　3．If Tom wins tomorrow, he _____ thirty races in the past four years.
　　A．will win
　　B．has won
　　C．would have won
　　D．will have won
　　4．If we believe something is good and true we should _____ to it.
　　A．hold up
　　B．keep on
　　C．hold on
　　D．keep up
　　5．If you _____ James, ask him to phone me.
　　A．should see
　　B．must see
　　C．might see
　　D．would see
　　6．If you are required to do some work, it must be done _____.
　　A．sooner or later
　　B．after all others
　　C．at last
　　D．in the long run
　　7．If you know what the trouble is, why you don't help them to _____ the situation?
　　A．simplify
　　B．modify
　　C．verify
　　D．rectify
　　8．I'm sorry, but what he thinks is not of the _____ important to me.
　　A．worthy
　　B．valuable
　　C．valueless
　　D．priceless
　　9．I'm sure your suggestion will _____ the problem.
　　A．contribute to solving
　　B．be contributed to solve
　　C．contribute to solve
　　D．be contributed to solving
　　10．I'm very much obliged to you _____ the information.
　　A．on
　　B．for
　　C．with
　　D．of