While ________ to foreigners,you must try your best to make yourself ________.
He has lived at for 30 years.
The book is of great value can be enjoyed form it until you have a deep understanding of it, however.
She studies ___ medicine before she turned ___ writer.
His uncle gave him books to read, but after a page or two he would put __book down and pick up__ new one.
A non-smoker can hardly imagine__ pleasure of having__ smoke after a meat.