Помогите пожалуйста! Use the Past Perfect Simple of the verbs given

Помогите пожалуйста! Use the Past Perfect Simple of the verbs given in the brackets to complete the sentences:


1.My brother went to Moscow after he (pass the exams).


2.He understood the rule after he (learn it).


3.She entered university after she (finish/the secondary school).


4.We wrote our compositions. We gave them to the teacher (after).


5.She was very tired because she (work a lot/that day).


6.The sun set. They finished their work (before).


7.The boys decided to make a sea voyage. They travelled in the Caucasus (after).


8.They finished their work. They went on an excursion (when).


9.they came home. Their friends rang them up (hardly).


10.They came home. It rained heavily (after).