My English teacher said I’m hard-working. —Really? You’re _______.

I have been trying my best to study English ________ I want to have a chance to be a volunteer for the Beijing Olympics. [ ]

This pair of jeans ________ them 300 dollars.

The doctor ____ the crying baby but couldn’t find out what was wrong with it.

He used _______ in Beijing, but he lives in Shandong now.