You are_____ young to understand it.
| A．too | B．very | C．much | D．so |
Bob asked me_.
| A．what was she doing | B．what is she doing |
| C．what she was doing | D．what she is doing |
—_did he come?
—He came to ask for help.
| A．How | B．When | C．Where | D．Why |
My brother and 1in Yinchuan since 1997.
| A．had lived | B．have lived | C．live | D．will live |
We have only one Earth. It’s our common _.
| A．family | B．house | C．home | D．room |