At no time ________ the rules of the game. It was unfair to punish them.
A．they actually broke
B．do they actually break
C．did they actually break
D．they had actually broken
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
How close parents are to their children ________ a strong influence on the development of the children's characters.
A．having B．had C．has D．have
The famous musician, as well as his students, ________ to perform at the opening ceremony of the 2012 Taipei Flower Expo.
A．were invited B．was invited
C．have been invited D．has been invited
Only by increasing the number of doctors by 50 percent ________ properly in this hospital.
A．can be the patients treated
B．can the patients be treated
C．the patients can be treated
D．treated can be the patients
Look! The ground is wet. It must have rained last night, ________？
A．hasn't it B．hadn't it
C．mustn't it D．didn't it
