SEOUL – Samsung Electronics, the world’s largest smartphone maker, said Thursday that it has sold more than 10 million units of Galaxy S4, in ______ a month since its debut (首次亮相).

If you are from doing something, you are officially prevented from doing it.

Who taught ___________ French—– Nobody. She taught ______________.

My brother is a knowledgeable person in his office.— books you read， knowledge you’ll gain.

So often ______ inrecent years that it has almost become a rule