You shouldn’t accept a gift from a person _____ you don’t know him.
| A．until | B．unless | C．if | D．whether |
I saw the boy _____ out a moment ago.
| A．run | B．runs |
| C．how to run | D．running |
He was made _____.
| A．go | B．gone |
| C．going | D．to go |
Returning to the room, _____.
| A．the book was lost | B．I found the book missing |
| C．the book was missing | D．I found the losing book |
_________ in the fields on a March afternoon，he could feel the warmth of spring．
| A．To walk | B．Walking |
| C．Walked | D．Having walked |