Every animal species play a _____ role in the ecosystem.
crucial
Tom _____ have been happy when his girlfriend left.
can't
Many _____ spiders and snakes live in Australia.
poisonous
I can't wait _____ what happens when Dad finds out about it. (see)
to see
There were dead fish floating in the dirty river, already starting to _____ .
decay
A: Where are your keys?
B: I'm not sure. I _____ have left them in the bar.
may/might/could
If a poisonous spider bites you, don't move as moving makes the _____ go through your body faster.
venom
When bees _____ somebody, they usually die.
sting
A: Did you know that Pete is dating Karen?
B: No way! You're _____ !
joking/kidding
I'm not gonna eat this food! It's _____ !
disgusting
A: Why didn't he come to the party?
B: Kate _____ not have invited him.
might/may
A potato beetle is a _____ . It can destroy a lot of crops.
pest
I've just seen that man _____ Joe's house! (enter)
enter
He's just left. He _____ have gone too far.
can't
Some dog breeds can be very _____ .
aggressive
I have to go to the shops _____ some milk. (get)
to get
We wash hands before meals to get rid of _____ .
germs
If you're different from other students, you're often _____ and lonely.
unpopular
I'm really happy _____ you. (help)
to help
You _____ have been thrilled when you won the lottery!
must
My parents always make me _____ for tests. (study)
study
I'd like to clear up the common _____ that older workers don't know how to use technology.
misconception
She's really enjoying the party and doesn't want _____ home. (go)
to go
Don't believe him. What he's just said is so _____ !
untrue