22.Food is easily lost in s_______; For instance, food stores are frequently eaten by mice.

21.The soldiers b________ their enemies when they took the small town by surprise last night.

20.The UN should pay special attention to the fact that many Africans are s_________ day after day.

19.Your friendship is most p__________ to me. I’ll treasure it forever.

18.The question is b_______ my power. Would you please help me?

17.We young students have a great t_______ for knowledge.

16.It was not a surprise that our football team d_________ some major teams in Asia.

15.A d_________ is a terrible accident such as an earthquake or an air crash.

14.If something is e_________, it seems as if you will never reach the end of it.

13.An i__________ refers to an organization set up to do a particular type of work, especially research on teaching.