“Did you hear someone knocking at the door?” “Yes, I did. I heard him______three times.”[ ]

How long have you lived in this town —_____ 2001.

__ Peter with his work, but I had a lot of things to do myself.

Do you know the most ancient city in China—Xi’an well?—No，this is the first time I ________ here

______ exciting the speech about “Belt and Road” was!–Of course! It was a really great inspiration to the world.