To learn English well, we should find opportunities to hear English ___________ as much as we can.
Some people ________ not have plans yet for New Year’s Eve, but others know exactly what they will be doing.
His conclusion, ______ on careful research, was acceptable.
It was __________________ back home from work.
There is no reason why you shouldn’t tell the headmaster _________ that you are resigning because he has arranged your post.
It was with great joy the couple found their missing son after 18 years.