．The recent study has shown that people's attitudes towards protecting the environment are not ________ with their behavior in daily life.

(2013·浙江，4)As the world's population continues to grow，the ________ of food becomes more and more of a concern.

 The patient was in bad need of operation but there was no guarantee(保证) that she would survive the anaesthetic (麻醉剂), which made the doctors on the horn of a __________.

__________ of the students who took part in the military training is 450.

——Recent years have________ rapid changes of my hometown.——Yes, I could hardly recognize it when I arrived yesterday.