___________ his arrival __________ the airport, he received a warm welcome from his students.
| A．At； of | B．On； of |
| C．At； on | D．On； at |
—_____doctors will be chosen to volunteer in the medical project.
—Really? I hope I’ll be one of them.
A. Thousand of B. One thousands of C. One thousand
—Would you mind____ the window for me? I feel hot here.
—No. I’ll do that. In fact, I feel like breathing the fresh air from outside.
A. opening; B. to open； C. open
—How was your day off yesterday?
—Perfect！It was my grandma's ________ birthday. We had a big cake.
A .eighty B. eightieth C. the eightieth
—Emma has been ill for a week. Is she all right now?
—________. The teacher says she can come to school tomorrow.
A. I think so B. That's it C. I'm afraid not
—When did the terrible earthquake in Lushan happen?
—It happened ________ the morning of April 20, 2013.
A. in B. at C. on