Can you guys help this?

1. Underlined nouns that show possession and Correct placement of the apostrophe

• the waitresses aprons

. economics classes

2- Making Nouns Possessive: Beyond the Basics.

.Is it correct to write Human Relations' Department? State Yes or No. If no, write it correctly.

. Is this correct: mothers-in-law's children? State Yes, or No. If no, write it correctly.

. It is correct to write McDonald's (for our fast-food restaurant)? State why.

. The singular name showing possession "Bill Gate's family" is correct. State why.

.Both CEO's signatures are needed. Is this showing possession correctly? State Yes or No. If no, type the correct plural possessive.

3- When you are in doubt about which plural to use when two forms are recognized as correct, the best thing to do is to consult a dictionary. When reading the dictionary, how do you know which plural is the preferred one?

Thanks so much.