单项选择
1. Among those ______ the ceremony were some experts and leaders.
A. who present B. who were present C. present at D. presented at
2. Some animals can _______ the color of their surroundings.
A. take on B. put on C. dress up D. have on
3. _________ you told me in secret, I had heard nothing about it.
A. While B. Until C. After D. Since
4. ______ of danger in the street at night by police, young women had to go home with a friend or a family member ______ them．
A.Having been warned; following B. warning; following
C.Having warned; following D．warned; followed
5. There is no point _________ with him and _________ is no need to talk with him.
