—Tom，where is your father?
—I’m not sure．He________in his office．
| A．must be |
| B．may be |
| C．maybe |
| D．need be |
Some people________feel sick when they read a book in a car or on a boat．
| A．must |
| B．should |
| C．may |
| D．need |
—________does this scarf belong to?
—Let me see．Oh，it may be________．
| A．Who；hers |
| B．Who；her |
| C．Whose；her |
| D．Whose；hers |
She is leaving________Beijing tomorrow．
| A．at |
| B．on |
| C．for |
| D．with |
—Do you know who the pen________?
—Sorry，I don't know．
| A．belong |
| B．belong to |
| C．belongs to |
| D．belongs |