If we _____ the tickets half a year ago, we would not be able to visit it on May Day now.
| A．did not book | B．had not booked |
| C．would not book | D．would not have booked |
I really don’t know _________ I had my money stolen.
| A．when was it that | B．that it was when |
| C．where it was that | D．it was where that |
_________ the problem of land erosion getting more serious, the government is searching for a way to deal with it.
| A．As | B．With | C．When | D．Because |
－Mom’s gift? She _______ have chosen a better one for me.
－She must be very happy to know it.
| A．should | B．might | C．couldn’t | D．mustn’t |
Everybody said it was an ideal marriage; no one had ever known ______ couple.
| A．the happier | B．a happier | C．a happy | D．the happiest |
Soccer is the most truly international team sport, but there’s still some question _______ whether it should be called a game or open warfare.
| A．due to | B．in addition to | C．as to | D．owing to |