For the first 5 questions, there are many possibilities; is there a word bank? For numbers 6-10, you'll need to know the object, its number, and its gender.
6) un ballon de basketball - orange
A basketball is orange, and the word "orange" in French does not change with gender.
7) des feuilles de papier - blanches
Sheets of paper are white, "blanc" in French. Because "feuilles" is feminine and plural, you write "blanches".
8) le tableau - marron
A table is typically brown. It is singular and masculine so no changes are needed.
9) les stylos du professor - noirs
Pens are often black, "noir." The word is plural, so an "s" is added at the end.
10) une gomme - rose
Erasers are usually pink. The word "rose" does not change with gender.