It's not ___________ that so many teenagers can't get enough sleep. (no wonder)
unsurprising
The victim died under mysterious circumstances. It's ________ that we will ever learn what happened.
unlikely / improbable
We ________ go into the science lab without permission. (It's not allowed.)
mustn't
"What does Rick wear to school?" "Just jeans and a T-shirt. They _________ wear a uniform."
don't have to
"Wow, your room is so messy!" "I know, I ______ clean up before my parents get home." (it's important for me to do so)
must
It really is rude not to greet your teacher. I never thought you were so ___________.
impolite
"Should I bring anything to the party?" "You _______ bring anything, but if you want, you can help with the decorations"
needn't
An __________ driver can easily cause a car accident.
irresponsible
This is where Sally began last year, and she's preparing for her first half-marathon now. Totally ____________, isn't it?
unbelievable
"I don't have any skis for the school skiing trip." "Don't worry, you ________ bring your own skis. (it isn't necessary) Most people hire them.
needn't
___________ women have a hard time finding love. (strong will, good job...)
Independent
Normally, we _______ use any electronic devices in class.
mustn't
What's this? Your handwriting is totally _________.
illegible
In literature, each student ______ choose something to read this year.
has to
"What's your superpower?" "I can become _________."
invisible
You ___________ do all the exercises. You're allowed to choose two of them.
don't have to
Ross grew ___________ waiting for her Rachel to arrive.
impatient
If you are ________ to a mafia boss, and you betray them, they will kill you.
not loyal, disloyal
You __________ look for that book in the library, I can lend you mine.
don't have to
My sister is so ________. She never cleans her room, and doesn't iron any of her shirts or trousers."
untidy
"Can you imagine him being _________?" "Sure thing. He's the biggest liar ever."
dishonest
"What ___ you ________ do in an escape room?" "You have to solve puzzles to leave the room."
do you have to
Quiz master: "Your answer is _______. You lose 50 million pounds."
incorrect
We're having the maths test tomorrow. You _______ forget to bring your calculator.
mustn't
Why do I earn less than a man in the same position? That's so ______.
unfair
If you are ____________ with your test results, the only thing you can do is to work harder.
dissatisfied
Smoking weed is ________ in most countries.
illegal
"Why is Eric so unhappy?" "He ______ take a test on Saturday morning."
has to