Fill in each of the blanks in the following sentences with a suitable preposition or adverb. (10%) 11. We hope that this will increase your awareness ____________, and help you to start using, this facility. 12. This is important, because you need to know what a system that performs well looks like prior ____________ troubleshooting performance. 13. Our memory is limited, but our imagination is unlimited, and it feeds _____________ optimism and hope. 14. He turned up at the party unexpectedly. This took me completely __________ surprise. 15. I asked her the reason for her absence, and she answered __________ hesitation. 16. It took me several minutes to figure __________what had happened. 17. The job is great ___________ terms of salary, but it has its disadvantages. 18. College students should channel their energy ___________ useful activities. 19. But there was a price below which they dared not go, for it had happened that a fisherman _____________ despair had given his pearls to the church. 20. In fact, they seem very uneasy ___________ the whole idea of strangers in their village.