He ______ it on schedule, but somehow he fell behind.

 If I went to the moon, I ______ bring something unusual back to the earth.

---Have you got the final result?---Yes, very disappointing. We________ have won the game.

We can hardly believe that an intelligent person like Daniel ________ be asking such a silly question.

 Surely Mr. Peterson ____ have forgotten to buy presents for his beloved family members. After all, it was Christmas!