1. once
I once wanted to be an astrophysicist.
Once again.
Once we thought that Man couldn't fly.
Once in a while everything goes wrong.
I'll pay you back once I receive my salary.
I once sat at the same table with him at a dinner party.
Once you skip a lesson, it's hard to catch up with your classmates.
She told me once and for all that she did not want to see me again.
He once lied and told her a rare creature lived in her closet.
All at once, the Buddhist priest burst into laughter, spoiling the solemn atmosphere.
Angola was once a Portuguese territory.
I don't understand and I'm not used to not understanding. Please explain it once more.
I know that it is highly unlikely that you'd ever want to go out with me, but I still need to ask at least once.
Tom brings his children with him to work once or twice a year.
The Japanese public bathhouse was once used as a center of social life in one's neighborhood.
2. time
Only time will tell.
This is a time of year when people get together with family and friends to observe Passover and to celebrate Easter.
I have to be honest. I was a little bit nervous the first time I had an MRI scan.
When the time is ripe, be bold and go for it! I'll stand by you.
It's because of you that we were able to complete this job on time.
Last year, I couldn't spend as much time with my children as I wanted to.
Time is more precious than anything else.
A boy is taking his sweet time pushing the cart toward the curb.
Spending time with your significant other should be high on your priority list.
I'd be grateful if you could take a look when you've got time sometime.
We don't have time to finish checking the figures now, but we can go over them after lunch.
Next time I visit San Francisco, I'd like to stay at that hotel.
Time passes by quickly.
As time went on, people grew less and less concerned about the matter.
Whenever you find yourself on the side of the majority, it is time to pause and reflect.