— ______. It's a long time since we had a good meal.

A. Well          B. That sounds like a good idea     C. Thank you              D. But I'm too busy

29. --I'm sorry to keep you waiting.

   --Oh, not at all. I ______ here only a few minutes.

A. have been ¡¡¡¡¡¡B. had been                C. was¡¡¡¡¡¡¡¡¡¡¡¡D. will be  

30. Here are two pairs of shoes, ______ you may choose.

A. both of them     B. either of them               C. any of which ¡¡¡¡D. either of which