Many people agree that never in history _________a more splendid opening ceremony than that of the Beijing Olympics

doesyour sister practice singing English songs? —-Twice a week.

Alice, you are supposed ______ part in the party in time.—Sorry, but I had an unexpected visitor.

Only then _______ how much damage had been caused.

Peru was a new world to me and I was ______ find out more about it for myself.