— Can I come to ask for some advice at any time?
—Yes, of course. ___________ .
| A．If you're convenient | B．At your convenience |
| C．Don't worry | D．Don't mention it |
27. She locked her room _____ a thief would break into it.
| A．in case that | B．for fear that | C．in case of | D．for fear of |
26. She said she would spend her holiday ___ Beijing.
| A．on | B．at | C．in | D．For |
25. Whenever I go to Beijing, ____ is quite frequent, I will go to visit the Great Wall.
| A．where | B．which | C．as it | D．It |
22. The two boys fought and fought until one ______.
| A．gave up | B．gave in | C．gave | D．gave off |
He will _____ our class to sing at the school singing contest.
| A．take place of | B．stand for | C．represent | D．representative of |