."Can you read?" Mary said _______ to the notice.

"We must keep a secret of the things _______ here", the general said,　_______ at the man in charge of the information office.

.China is one of the largest countries in the world, _______ 9.6 million square (平方) kilometers.

The old sick lady entered the hospital, ______ her two sons.

. _______ different kinds of pianos, the workers farther improved their quality.

A person _______ a foreign language must be able to use the foreign language　_______ all about his own.

The library's study room is full of students _______ for the exam.

People _______ in the city do not know the pleasure of country life.

The _______ price will save you one dollar for each dozen.　

The student corrected his paper carefully, _______ the professor's suggestions.