More and more problems appeared ________the increasing use of short messages sent by cell phones.
What do you enjoy ____ your spare time?
The workers were working from 7:00 a.m. to 7:00 p.m. that day, only ____ once at noon to have their lunch.
If the weather had been better, we could have had a picnic. But it ____ all day.
-_____ you read the story?-Yes. I _____ it at school.
There is only one more day to go ____ your favorite music group play live.