---Is your uncle Tom a soldier?
--- No, but he once _____ in the army for 4 years.
| A．served | B．is serving | C．has served | D．had served |
For a long time they walked without saying ____ word. Jim was the first to break
____ silence.
| A．the; a | B．a; the | C．a; / | D．the; / |
He had a wonderful childhood, _____ with his mother to all corners of the world.
| A．travel | B．to travel | C．traveling | D．traveled |
It took me a long time before I was able to fully appreciate what they _____ for me.
| A．had done | B．did |
C．would do | D．were doing |
With difficult problems ___, the president feels relaxed now.
| A．settled | B．settling | C．to settle | D．being settled |
Little _____ that we were watching his every move, so he seemed to be going his own way in his business.
| A．he realized | B．he didn’t realize | C．didn’t he realize | D．did he realize |