The financial crisis has put the world economy in a difficult _________.
___________ so delicious, the soup is very popular with the kids.
__________ these tips, and your time _______ doing research on the Internet _________ much worthwhile.
While doubts about the medicine’s safety have____________, interest continues to grow.
Do you know in what circumstances was it____________ Jack achieved his goal?
If penicillin _____________ available, many people ______________ from sickness.