Most French verbs use the present tense forms of the verb AVOIR as their helping verb in the passe compose.
Of course, there are a few exceptions to this, but we won't worry about them right now.

Do you remember the forms of AVOIR? Test yourself here:
1. Je/j' __________ un cahier de français.
2. Mon prof ____________ un stylo violet!
3. Thomas ____________ des bon-bons.
4. Nous ne/n' ___________ pas d'argent.
5. Elise et Sophie __________ des robes.
6. Vous ___________ un crayon?
7. Luc et Jerome ____________ des livres.
8. Tu _________ un verre d'eau? J'ai soif!