Helen is on time for everything. How ______ it be that she was late for such an important interview?

Kate is new in Chengdu. Maybe she needs an ______ to find the places.

______ building did the firemen save the old woman from last night – The blue one.

It is hard to imagine a student _______doesn’t know how to skate in Harbin.

(2009浙江宁波质检)One of the best ways for people to keep fit is to _______ healthy eating habits．