[Q]: How does the sentence end?

Joel asked Robert how long will the flight be before they arrive, because 

[A]: Joel had forgotten.


[Q]: How does the sentence end?

Christopher was ashamed he broke Logan's lamp, so 

[A]: Christopher hid the broken pieces under the couch.


[Q]: How does the sentence end?

Natalie had a mosquito bite on their arm while Jennifer did not, so 

[A]:
Natalie had an itchy arm.