问题
I remember a _____ famous scientist said that we should believe in ourselves first of all.
A:some
B:certain
C:sure
D:other
B:certain
C:sure
D:other
正确答案是：
同类题型
(2013·四川，9)Nowadays people are more concerned about the environment________they live.
Jane likes collecting stamps very much. In fact, her interest in it ___back to her school days.
We’ll discuss the problem ______ lunch time[ ]
Wind power is an ancient source of energy ____we may return in the near future.