an official paper that is accepted as proof of something
This certificate is rare.

a test to determine a person's health or knowledge in a certain subject
The examination went well.

a person who teaches or instructs, usually as a job
The instructor doesn't know the material well.

a polite written or spoken offer for someone to attend an event, perform an action, or go somewhere
He gave many invitations.

to come down to the surface or the ground
We landed on the island.

a game used to create income for the government or a charity in which many tickets with distinct numbers are sold and a few numbers are chosen by chance to receive prizes
We won the lottery.

repeatedly
over and over we came back.

a person whose job is to fly planes
He can't pilot this plane.

not to accept, allow, or give something
She refused to eat.

in an inexact or imprecise manner
There are roughly 20 people here.