In most big cities, it is easier     1     (hire) a taxi at a moment’s notice when the weather is good. But when it’s raining, people have a much harder time finding one. One obvious reason is that many people     2     walk short distances during good weather prefer to take a taxi in the rain. Therefore, taxis tend to be more fully filled on     3     (rain) days. Besides, the supply of available taxis is also smaller because taxi drivers can     4     (easy) reach the target fares and go home early.