课时作业(三十七) [选修8 Unit 2 Cloning]
(限时：35分钟)
Ⅰ.单项填空
1．________for almost two years, he now wants to find something useful to do.
A．Retiring
B．Having retired
C．To have retired
D．Being retired
2．Why________to go abroad to study when there are so many good universities at home?
A．imagine B．bother
C．consider D．prevent
3．It ________me all of a sudden that I had left my key to the car in the office.
A．thought B．struck
C．happened D．occurred
4．—Do you like what she is doing?
—No. I think what she is doing is________to raise arguments.
A．fond B．bound
C．eager D．actual
5．Jenny works hard as usual and it has________．She got the first in the final exam again.
A．showed off B．paid back
C．paid off D．turned up
