21. — I’m sorry to have caused you so much trouble.
—_______.
A. That’s all right B. My pleasure C. Nothing at all D. You’re welcome
22. Look! My suit is badly out of _______. There must have been somebody sitting on it.
A. date B. balance C. shape D. order
23. It was over a decade _______ they paid off all their debt. You can imagine what a hard life they had.
A. until B. before C. after D. while
24. Tom’s leg got hurt when _______ up Jindingshan.
A. climbing B. his climbing C. he climbed D. climbed