If you see an alligator, you should ________ from it.
run away
This is really serious. You ________ tell anyone.
a. can b. can't c. have to d. don't have to
b. can't
Good bye. Maybe I ________ (see) you tomorrow.
will see
Polar bears _______ (disappear) if global warming _______ (continue).
will disappear, continues
I __________ (work) here for / since 2005.
have worked, since
If a puma comes near you, you should ________ with sticks and rocks. Try to appear as big as possible and make aggressive noises.
fight back
He has lots of time. He _________ hurry.
a. can b. can't c. has to d. doesn't have to
d. doesn't have to
It's very dark and cloudy. Take an umbrella. It __________ (rain) before you get to school.
is going to
Sit still! The dog _________(not come) to you if you _______ (not be) relaxed.
won't come, aren't
She __________ (have) her bike for / since 2 years.
has had, for
If you are attacked by bees, you should run away. If you run through bushes, the bees will _______________.
slow down
I _______ go to the party this weekend if my parents let me.
a. must b. can c. don't have to d. can't
b. can
I _______ (go) to the doctors tomorrow. I'll see how I feel in the morning.
may go
I ________ (study) for my exam when the movie ______ (end).
will study, ends
__________ (he / be) back to the US for / since last Christmas?
Has he been, since
Bears are very fast and can climb trees. If you see one, don't try to __________. Stay calm and move away slowly.
get away
You ___________ bring any food to the party. We will cook for everyone.
a. mustn't b. must c. don't have to d. may
c. don't have to
Do you think you _______ (live) in a foreign country someday?
will live
Before we _______ (eat) dinner, I __________ (go) to the bakery to get some bread.
eat, will go
Judith __________ (not talk) to her parents for / since last month.
hasn't talked, since
It's best to __________ from bears and they don't want to be near humans either. If you _________ a bear, don't run. It's better to play dead if you are attacked.
stay away, come across
If you don't study, you ______ fail your English exam.
a. have to b. can't c. may d. must
c. may
I'm meeting Susan after class today. We _________ (see) a movie at the cinema.
are going to see
If all of the insects _______ (die), the ecosystem ________ (collapse).
die, will collapse
We __________ (study) English for / since years.
have studied, for