There are many trees on sides of the river.

I have failed three times. However, my father encourages me _____ fourth try.

The boy was so careless that the glass fell from his hand and it ______ on the floor.

．—I did not know you were good friends．—You___．I have known her since she moved here．You were abroad then．

r ran into a crowd of middle schoolstudents, ______to hospital immediately.