They replaced the old futon with a memory foam mattress because the 
OPTIONS:
- futon had a low level of comfort.
- mattress had a low level of comfort.
futon had a low level of comfort.

To visit Brian in Rome, Robert flew there but visited a hotel first because 
OPTIONS:
- Brian wanted to surprise him.
- Robert wanted to surprise him.
Robert wanted to surprise him.

Susan was making a cake for a party then realized she had flour but she didn't have milk. It was unnecessary to go to the store for the 
OPTIONS:
- flour .
- milk .
flour .