Students ______ wear uniforms in our school. It's a rule.
can
have to
had to
could
He ______ wake up early tomorrow for his flight.
has to
We ______ wait in line yesterday. There was no one else at the counter.
couldn't
don't have to
can't
didn't have to
Children ______ play outside after finishing their homework.
______ you help me with this heavy box?
Had to
Can
Could
Have to
When my grandfather was young, he ______ walk to school every day.
In the past, people ______ use the internet because it didn't exist.
She ______ work on weekends at her previous job.
You ______ use a calculator during the math exam. It's not allowed.
Yesterday, we ______ finish our work before leaving the office.
You ______ buy the book if you don't want to. The library has copies.
I ______ understand the lesson yesterday. It was too difficult.
My sister ______ speak three languages fluently.
When I was a child, I ______ climb trees very well.
They ______ attend the meeting. It's mandatory for all employees.