1.With a 3D printer, a cook can print       complicated      (complicate) chocolate sculptures and beautiful pieces for decoration on a wedding cake.

2.Some colleges and universities have students from many different      racial      (race) and ethnic minorities.

3.There is a great deal of      variation      (vary) among the responses.

4.Our task is to challenge the UN to make a      swift      (swiftly) decision.

5.When the night comes, occasions are not rare when the citizens      are entertained      (entertain) by the performers in Sichuan Opera.