The ticket for the concert is in great need, so if you want one, please get in touch with us_____.
--- Can you find me _______ symbol of China? --- ______ Great Wall.
Bob ________ with us together since he came to our school.
When I came into the teacher’s office, he ________ on the phone.
Tony decided to study abroad _______ he knew he would meet many difficulties.
--- We want to sit at the table near the window. --- I am sorry, but it _______ already.