Whenever my grandmother calls just to chat with me，I drop everything and enjoy the moment，knowing these times__________pass．
| A．call | B．must | C．shall | D．might |
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 |
----_____he dropped out of school?
----His family has run into financial difficulties.
| A．Why was it that | B．Why was that | C．Why was that it | D．Why was it |