Donald was very grounded but Michael often got lost in their daydreams. 
OPTIONS:
- Donald was very serious all the  time.
- Michael was very serious all the  time.
Donald was very serious all the  time.

The photographer could not fit the pictures inside the frames because the 
OPTIONS:
- frames were too little.
- pictures were too little.
frames were too little.

Justin showed Joseph his old high school track and field records.  
OPTIONS:
- Justin was impressed.
- Joseph was impressed.
Joseph was impressed.