Problem: How does the sentence end?

Emily asked Rebecca what time the dress store closes in the mall, because
Answer: Emily had forgotten.

Problem: How does the sentence end?

Robert told Dennis that the children had to go to sleep by 9pm because
Answer: Dennis was babysitting.

Problem: How does the sentence end?

The woman tried to use the small comb to brush her hair but the
Answer: hair was too strong.

Problem: How does the sentence end?

Michael asked Derrick if he knows how to trademark a name, but
Answer:
Derrick doesn't know.