As you know, it is my duty to __________ my younger sisters from being hurt when they are in danger.
The plane of the Polish president was about to land ______ it snagged(挂) treetops and crashed, ______ the president and 96 others on board.
Mum ______ to us. “Be quiet! Your little sister is sleeping.”
Einstein’s theory, which was doubted by most scientists at first___out to be correct in the end.
—Thank you for offering me so much advice on English learning, Tom. —_______ .
He thinks so highly of the movie Avatar that he thinks it is worth seeing ______ second time.