. _____ with letters and public phones, mobile phones and the Internet are faster and much more convenient.
Bird flu , a contagious disease of animals , is believed ____ by viruses that normally infect only birds and less commonly pigs , and rarely humans .
—I didn’t go to the Museum yesterday. —Yes, but I would rather you ______there too.
Some friends tried to settle the quarrel between Mr. and Mrs. Brown without hurting the feeling of _____ , but failed .
—Why? Where is the key to the meeting room? —Dear me! You ______ it in the taxi!
____in faraway northwest , this place has its beautiful fresh air .