(32 points) 1. The common time units we have learned are:,,,,. 2. There were days in February 2003, * * * days in the whole year and zero days in a week. 3. In 1990, 1920, 192 1 996, 2000, _ _ _ _ _ _ _ _ _ _ _ is the normal year. 4. How many months are there in a year, and each month has 3 1.