_______ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city．
A．Being examined B．Examining
C．Examined D．Having been examined
What a pity! ________joined in the party, I would have met my old friend．
A．lf I have B．Had I C．I had D．Have I
Today's homework was easy _______so I finished it quickly and went out to play．
A．to be done B．done C．doing D．to do
Don't you think _______of great importance that we should keep fit by taking exercise regularly?
A．this B．that C．which D．it
The news was a terrible blow to her, but she ______the shock soon．
A．got out B．got over C．got off D．got through
．When he goes out, he often wears sunglasses _______nobody can recognize him．
A．so that B．now that C．in case D．as though
