He went carefully through his homework_____________make mistakes.
| A．so that | B．in order to |
| C．in order not to | D．in order to not |
— I phoned you yesterday morning. A girl answered, but I didn’t recognize the voice.
— Oh, it ____ my younger sister. She was in my room at that moment.
| A．must have been | B．should have been |
| C．could have been | D．may have been |
Not far from the club there was a garden, ____ owner seated in it playing bridge with his children every afternoon.
| A．whose | B．its | C．which | D．that |
They ______ on the program for almost one week before I joined them, and now we _____on it as no good results have come out so far.
| A．had been working; are still working | B．had worked; were still working |
| C．have been working; have worked | D．have worked; are still working |
— Have you heard of the North Korea’s nuclear test?
— Yes, ________ news came as ________ shock to me.
| A．the; a | B．the; the | C．a; a | D．a; the |
Mr. Bush is on time for everything. How_____ it be that he was late for the opening ceremony?
| A．can | B．should | C．may | D．must |