[Q]: How does the sentence end?

The wheels and the reflectors on the bike need to be changed. The 

[A]: wheels are too flat.


[Q]: How does the sentence end?

Michael was outgoing but Ian was shy, so 

[A]: Michael always wanted to be the center of attention.


[Q]: How does the sentence end?

Joel is on his final year and asks for help from his lecturer Joseph about doctorate, because 

[A]:
Joel wants to get a PhD.