Bonjour

mettre à la voix passive =

1- A standarized admission test must be taken by international students.

2-An F1 visa will be needed by students to work during their studies.

3- A financial boost in recent years from international students  has been received by US colleges and universities.

4- Optional Partical Training (OPT) is being developed by American higher education.

voix passive, concordance des temps =

n° 1 & 4 = modal + infinitif ==> modal + be + p. passé

n° 3 = present perfect   ==> p. perfect continuous : have[present] + been + p. passé

n° 4 = présent be + ing    ==> be [présent] + being + p. passé

bonne fin de journée :)