.Professor White has received a letter ___ to give a lecture in Peking University.

_________the answer, the boy, who asked the question, still stood with his hand ______.

With tags(标签) _____ to the luggage, it won’t take long for the passengers to find theirs correctly..

Technology is developing so rapidly that   for only a year , my cellphone is out-of-date .

Jack had his house _______ last night and he and his family were left homeless.