(2013·江苏，27)“Never for a second，”the boy says，“________that my father would come to my rescue.”

A．I doubted  B．do I doubt

C．I have doubted  D．did I doubt

(2013·湖南，35)Not once________to Michael that he could one day become a top student in his class.

A．occurred it  B．it did occur

C．it occurred  D．did it occur

(2013·福建，34)Not until he went through real hardship ________ the love we have for our families is important.

A．had he realized  B．did he realize

C．he realized  D．he had realized

—Take this medicine three times a day，Tom!

—Do I have to take it？It ________ so terrible.

A．is tasting  B．is tasted

C．tastes  D．has tasted

It seems that water from this tap ________ for some time.We'll have to take it apart to put it right.

A．had leaked  B．is leaking

C．leaked  D．has been leaking

—I hear Jane has gone to the Holy Island for her holiday.

—Oh，how nice！Do you know when she ________？

A．was leaving  B．had left

C．has left  D．left

The discussion ________ alive when an interesting topic was brought in.

A．was coming  B．had come

C．has come  D．came

My mind wasn't on what he was saying，so I'm afraid I ________ half of it.

A．was missing  B．had missed

C．will miss  D．missed

All the preparations for the task ________，and we're ready to start.

A．completed  B．complete

C．had been completed  D．have been completed

Selecting a mobile phone for personal use is not an easy task because technology ________ so rapidly.

A．is changing  B．has changed

C．will have changed  D．will change