Problem: How does the sentence end?

The book doesn't fit into the oak bookcase shelf because the 
Answer: book is too tall.

Problem: How does the sentence end?

Jeffrey gave the rope to Nick because 
Answer: Nick needed to tie his boat to the dock.

Problem: How does the sentence end?

The rose withered in the garden, but grew heartily in the pot, since the 
Answer: garden was lacking in nutrients.

Problem: How does the sentence end?

Bill replaced the chicken bone in his soup with cabbage after it cooked for a couple of hours, the 
Answer:
bone was sharp.