At present, how we can look after ______ old is becoming ______ hot and severe issue.
The teacher asked more _____ to prevent the students’ eyes from being injured.
The beach is so beautiful that it is worthwhile, I think, _____ for a short holiday.
“Well, I’ll tell you a secret ...” said the boy, with his mouth almost _____ my ear.
They looked forward with hope _____ a chance to receive further education.
I regret _____ hard at school, or I would have succeeded in passing the exam.