问题

Once upon a time,a(n)________famous scientist said that life was not easy for any of us but first of all we should believe in ourselves.
A:another
B:sure
C:some
D:certain
B:sure
C:some
D:certain
正确答案是:
同类题型
I did not give offence to you ___________—Forget it Let’s make up
The two sides have finally___________, though some small differences still exist.
_ wellprepared a gymnast is, he still needs a lot of luck in performing.
Could you please clean the living room, Tim— . I have to take the dog for a walk.