Only when ____hard____make your dream come true.

Have you found your book yet? — No, I’m not sure where I________ it?

ub, _ _ 25 yearsago, is holding a party for past and present members.

Have you found your English book? — I am not sure ____ I could have left it.

I did really well in the examination, Li Ke— I did ______ I got full mark