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.
——Did you know any French before you arrived in Washington? ——Never ____ it, actually.
____ the search engine just gave me some brief introductions rather than the whole content of the book to read.
The program is like a window on the world ____ you sit by it and fix your attention on what it shows.
——Ms Lin looks rather a kind lady. ——But in fact she is cold and hard on us. You ____ believe it!
Will you see to ____ that my birds are looked after well while I’m away?