e you ______ still have anything to offer, please contact our manager while he is available

Look! The man at the gate ______ be our headmaster.He is always standing there every morning.—No, it ______be him. He is holding a meeting in theoffice now.

a sudden, I felt dizzy _______my room started to spin

The camera is __________ expensive __________I can’tafford it.

The book was written in 1946， the education system has witnessed great changes.