Whether ways will be found to help China _______ the current world financial crisis is just _______ worries the public.

Every Monday morning, students in our school would stand at attention, watching the national flag ______.

---Bob has gone to California.  ---Oh, can you tell me when he ____?

 --- Hi, Torry, can I use your computer for a while this afternoon? --- Sorry, __________.

Over the past decades, sea ice _______ in the Arctic as a result of global warming.