Simon was _____ why many of his friends didn’t turn up at his birthday party.
The old couple don't want to _______ their son and still live in the countryside although their son urged them to move to the city and live with his family several times.
He is very angry because the bag _____ on the net a month ago hasn't arrived yet.
When the old man recalled the old hard times, he always said, “ It was the first time that I ____ a full meal. I remembered it forever.”
_____ food is hard to find, few birds remain throughout the year.
.UNESO is an international organization ,which _____ United Nations Educational, Scientific and Cultural Organization.