_____ we know, Mr. Black is an expert on language teaching. A As B That C Which D What
Wang Mei is one of many Chinese teenagers _____ “on the go”
He was born ____ a very cold night _____ December.
When he knocked at the door, my mother was busy ____ supper.
He waited until it was dark ____ nobody could see him clearly.
Now there are many _____ in our company.