We have every reason to believe that_______2008 Beijing Olympic Games will be_____success.
Can you explain ________ the sun goes down in the west?
A huge amount of oil was spilt on the East Sea, the causes of ______ are still under investigation.
--- Has James finished his report on his Enquiry Learning yet?\ ---- I’m not sure. He _____ on it last week.
If you are traveling_ the customs are really foreign to your own,please do as the Romans do.
you may have, you should gather your courage to face the challenge.