The International System of Units (SI) is a revision of the ___1____ system. There are __2____ SI base units. In SI, the base unit of length is the ___3____. The Space taken up by a cube that is 10cm on each edge is one __4___. A measure of the pull of gravity on an object of given mass is its __5___.
2. There are seven (7) SI base units.
4. A cube 10 cm x 10 cm x 10 cm = 1000 cm^3 = 1000 cc = 1 dm^3 (decimeter cubed) = 1 L. The liter is not an SI unit but it is approved by one of the committees in the US for use with the SI system. Whether 1 L or 1 dm^3 goes in the blank is for you to decide based upon your notes and what your teacher has told you.
5. ok. However, weight is not an SI unit either.
Here is a site for you to obtain more information on SI units. http://physics.nist.gov/cuu/Units/units.html