join the beginning and ends to get the sentences that make

1. After William had read four detective stories, he thought he could solve any mystery himself. 2. When Bill had learnt the last idiom, he felt he could take no more. 3. When Charlie had finished painting, he decided to give his picture to the school museum. 4. After John had practised driving the car, he understood he would never pass the driving test. 5. After he had written out all the unknown words, he started to learn a theme.

A "theme" (old-fashioned, North American English) is a short piece of writing on a particular subject, done for school.