[Q]: How does the sentence end?

All of my clothes wouldn't fit in the suitcases because the
OPTIONS:
- clothes were too big and heavy.
- suitcases were too big and heavy.

[A]: clothes were too big and heavy.

[Q]: How does the sentence end?

You are going to learn more about the species watching them reproduce in their natural habitat than in a lab because the
OPTIONS:
- habitat is more comfortable for them.
- lab is more comfortable for them.

[A]: habitat is more comfortable for them.

[Q]: How does the sentence end?

For the birthday party the parents bought puppets instead of toys for the children because the
OPTIONS:
- puppets were fun.
- toys were fun.

[A]:
puppets were fun.