Do you promise ___ (not tell) anybody?
not to tell
You forgot ___ (lock) the door last night.
to lock
A lot of scientists are interested in ___ (study) these extraordinary animals.
studying
The lady demanded ___ (speak) to the manager.
to speak
Many animals appear ___ (have) a very good sense of direction.
to have
Some birds may use the Earth’s magnetic field to help them ___ (fly) long distances.
fly
When they lose a leg or eye, their body lets them ___ (grow) a new one.
grow
I’m not sure who ___ for permission.
to ask
Imagine ___ (know) what your friends really think.
knowing
A fly's eyes allow it ___ (see) things happening in slow motion, so it almost always manages ___ (move) away in time.
to see, to move
I regret ___ (tell) Craig my secret. Now he has told everyone.
telling
I'll never forget ___ (meet) you for the first time.
meeting
You are required ___ (complete) this worksheet.
to complete
The journeys of some birds involve ___ (travel) over huge mountain ranges.
travelling
No one can work out how ___ (produce) a battery.
to produce
Imagine ___ (sail) through the ocean with whales all around you!
sailing
Scientists have suggested ___ (power) it with a nuclear reactor.
powering
Someone has managed ____ (make) a piece of the material.
to make
After ___ (see) an advert in a wildlife magazine, I really wanted ___ (apply) for a place on a whale conservation project on a boat in Scotland.
seeing, to apply
I'll carry on ___ (work) until I get tired.
working
Whales use sound to work out which way ___ (swim) to find food or a mate.
to swim
Will you be able ___ (give) me a lift to the airport tomorrow?
to give
My parents have encouraged me ___ (watch) lots of TV documentaries about whales.
to watch
I tried ___ (get) to class on time but the bus was delayed.
to get
If you plan ___ (kill) a fly, don’t expect ___ (do) it easily.
to kill, to do
Do you need ___ (revise) gerunds and infinitives?
to revise
I’m really looking forward to ___ (spend) time on the boat
spending
Do you mind ___ (wait) for me? I'll only be five minutes.
waiting
They seem to avoid ___ (go) the wrong way, even though they have no maps or sat nav.
going
My computer has broken but I can't afford ___ (buy) a new one.
to buy
I learned ___ (speak) English when I was five.
to speak
I can't help ___ (sleep) in late. It's Sunday!
sleeping
Everything appears ___ (be) three times closer.
to be
I enjoy ___ (spend) time at home.
spending
Whales are famous for ___ (be) very big, but it’s their communication that interests me most
being
It's getting late. We would better be ___ (go) home soon.
going
Scientists expect it ___ (be) more accurate soon.
to be
Some animals make even the strongest human ___ (seem) hopelessly weak.
seem
There’s a type of beetle that’s capable of ___ (pull) 1141 times its own body weight
pulling
Luckily, my parents agreed ___ (pay) for the trip, and it’s all arranged for next summer
to pay
This makes it ___ (disappear) from view.
disappear
Did you manage ___ (book) the hotel for this weekend?
to book
Most of us wouldn’t know how ___ (get) home if we were lost.
to get
Knowing more about animals’ abilities makes them ___ (seem) even more amazing!
seem
Their amazing abilities haven’t helped them ___ (survive) in the wild.
survive
What are you planning on ___ (do) tonight?
doing
It allows you ___ (lift) 200 kg as if it were just 4 kg.
to lift
I’ve always enjoyed ___ (find out) about whales
finding out
For some species, this involves ___ (make) noises that can be heard thousands of kilometres away.
making
The scientists created a safer environment for the axolotls by ___ (clean) the water.
cleaning
If people can avoid ___ (pollute) the water in the future, perhaps the axolotls have a chance.
polluting
You should stop ___ (smoke), it's not good for your health.
smoking
This didn’t seem ___ (help).
to help
They intend ___ (keep) looking until April.
to keep
Scientists are interested in ___ (learn) more about these abilities.
learning
New types of earbuds let you ___ (control) the sounds you hear.
control
You are not allowed ___ (park) here.
to park
Bees manage ___ (find) their way back to the hive from many miles away.
to find
Have you ever dreamt of ___ (be) a superhero?
being