一、单项选择（共15小题，每小题1分，共15分）
1. Everyone should do something _________ wild animals.
A. to protect B. protecting C. protect D. to protecting
2. It’s not easy for me ________ t he work.
A. finishing B. to finishing C. to finish D. finished
3. Please tell me ________.
A. to choose which B. which to choose
C. which choose the one D. choose to which
4. The class meeting ________ from 3:00 to 4:00 yesterday.
A. began B. starts C. lasted D. started
