Word Formation C1
It's not actually possible to fail a _________ test.
personality
People think that Edison invented the light bulb (THOUGHT). Edison _____ the light bulb.
Edison is thought to have invented the light bulb.
I'm convinced that I was woken up by some kind of noise (MUST). It ______ some kind of noise that woke me up.
It must have been some kind of noise that woke me up.