The growing speed of a plant is influenced by a number of factors, _____ are beyond our control.
We decided not to climb that mountain because it was raining_________.
Ben has not the least_______ of giving up his research.
I wrote him a letter to show my______ of his thoughtfulness.
The surgeon_______ his excellent skill in carrying out the operation.
It is widely accepted that young babies learn to do things because certain acts lead to________.