求答案Thousands of years ago,people did not know 36 to make a fire．
Thousands of years ago,people did not know     36     to make a fire．When it was very    37     at night,they could not sleep well．Sometimes lightning hit（打,击） a    38    and started a fire.At first people were both surprised and    39    to see the fire．They were afraid to go up．Later a few   40     men took some of this fire and made a fire near their homes．They used the fire to keep them warm and to cook food．When they had a fire,they did not let it    41     burning．If it stopped,they could not start it again．Maybe they had to    42   for a long time,sometimes for    43    ．Later they     44     how to make a fire with pieces of wood． Now we have matches,we can put them in our pockets and make a fire when we want to make it．But we have to be    45     with fire．36．A．what      B．how         C．when        D．where37．A．cold        B．hot         C．warm         D．cool38．A．person      B．mountain(山)   C．field          D．forest(森林)39．A．glad       B．afraid        C．ready         D．tired40．A．very        B．brave         C．sad        D．happy41．A．stop       B．make        C．be           D．start42．A．work      B．play        C．wait         D．1ive43．A．minutes     B．hours         C．days         D．years44．A．forgot      B．decided     C．1earned       D．told45．A．angry       B．pleased     C．careful       D．busy