He was crying ______ he found his mother.
before
as soon as
but
They won't begin the match _____ I arrive.
when
until
after
I will visit Ha Noi City _____ I come to Vietnam.
while
when
as soon as
Global warming is serious ______ we are releasing a lot of carbon dioxide.
until
as soon as
because
____ we were building a campfire, John and Mark were preparing lunch for us.
After
While
When
You can go home _____ you finish your exercises.
till
before
as soon as
We shouldn't use single-use products _____ they are harmful to the environement.
as soon as
because
after
He will wait at the cinema _____ we come.
or
because
til
_____ I arrive home tonight, I will play games.
Until
As soon as
But
I want to play badminton with my friends _____ school.
as soon as
after
when
_____ we meet him, we will call you.
As soon as
Because
Before
_______ planting trees, we need to water them regularly.
After
Until
Before
______ we were planting trees, our friends were picking up rubbish.
While
After
When
Before
_____ Jenny left the party, she said goodbye to the host.
While
Before
After
I joined an environment programme ________ I had finished high school.
as soon as
because
while
________ I went to bed, I had brushed my teeth.
When
After
Before
It's 4 p.m. I must get to the bank _____ it closes.
until
after
before
____ the amount of carbon dioxide reduce, the environment will become better.
After
While
When
_______ I was cooking, my mother was watching TV.
when
while
till
______ you leave your room, please turn off all the devices.
Before
Until
After