The first African-American president of the United States received a(n) _____ welcome in the African countries, where he was received as a returning son.
Simon was _____ why many of his friends didn’t turn up at his birthday party.
Without gravity, we _____ walk on the ground as freely as we do now.
Zhang Heng, one of _____ best-known Chinese astronomers, showed a strong interest in _____ astronomy as a child.
— Could I have another cup of coffee, Daddy? —_____ It will be hard for you to go to sleep tonight if you do.
With a report _____ about the accident, the policeman has to find some witnesses for help.