—Tom, you are caught late again.
—Oh, __________.
| A．not at all |
| B．just my luck |
| C．never mind |
| D．that's all right |
Mary often helps her best friend, ______ math is very poor.
| A．whose | B．who | C．what | D．where |
Beijing is _____ capital of _____ China.
| A．the; the | B．the; / | C．a; the | D．a; a |
To be able to catch up with the other students, he needs ___ hard work; he needs your encouragement, too.
| A．other than | B．rather than | C．less than | D．more than |
___ you have finished your homework, you can go and play with your friends.
| A．As if | B．So that | C．Even if | D．Now that |
She knows so much about England. She ___ there before.
| A．must be | B．must live |
| C．must have been | D．must have lived in |