Leaves are found _______ all kinds of trees, but they differ greatly ________ size and shape.
Cloning humans has been _____ in the science world for many years and it is likely to continue .
The woman she acted in the film is ______ the women in the 1930s.
The general manager thought _______ of these problems before he made the final decision.
If only you __________ him what I said! Everything would have been all right.
We didn't know his telephone number, otherwise we _________ him.