ESERCIZIO NUM: 2873 - CATEGORIA: verbi > past-simple past-continuous present-perfect - DIFFICOLTA': ****
CLICCA QUI per aprire un TUTORIAL sui VERBI prima di svolgere l'esercizio

Completa il brano con il PAST SIMPLE, PAST CONTINUOUS oppure il PRESENT PERFECT dei verbi tra parentesi.

Mark Zuckerberg (start) Facebook in 2004. At that time Mark was (study) psychology and computer science at Harvard University. While he (attend) Harvard, he (meet) his girlfriend Priscilla: they(marry) eleven years later, in 2014. Five hundred million people have(join) Facebook since 2004, and hundreds(become) Mark's friends. Mark(make) a lot of money and has(use) his millions to fund a variety of philanthropic causes.