1.his letter enclosed a picture.
2.the money enable him to buy a new car.
3.the free market system is endangered.
4.the pond was encircle with trees.
5.she enjoy good health.
6.the optimal formula which would encompass all these factors has not been proposed.
7.the doctors are engaged in cancer research.
8.Could you enlarge on your new theory?
9.It is the way that she laughs at herself that endear her to me.
you should enrich your mind when young.