21. I was told that Rose said something really bad behind my back. I felt __________ and upset.
A. betraying B. betrays C. betrayed D. being betrayed
22. _________ to go to a key university, he works hard and is trying his best to improve his English.
A. Being determined B. Determined C. Having determined D. To determine
23. Some scientists point out that if you clone an embryo, you can produce valuable human tissues __________could be used to save human lives.
A. that B. / C. what D. for which
24. My brother is a good student, _________in No.15 Middle School.
A. studying B. studied C. to have studied D. to be studying
25. I wanted to find a new boy friend, but my best friend told me __________.
A. to do B. not to do C. not to D. not doing
