基本信息
21. ---Shall I give you a hand with this as you are so busy now?
---Thank you. ______.
A. It couldn’t be betterB. Of course you can
C. If you likeD. It’s up to you
22. The birds, ______ by the presence of the scientists, disappeared really quickly again.
A. frightenedB. being frightened
C. have been frightenedD. were frightened
