People living in the area where there is a lack of electricity often keep a supply of candles ________power failure.
______ life began on earth is one of the biggest puzzles that scientist found hard ______.
Was it because his mother was ill ______ he didn’t go to school?
What ______ will it ______ whether you are a boy or a girl ? As long as you set your mind to it, nothing can be difficult.
which of the following sentences is right ?
The policeman stopped him when he was driving home and ______ him ______ speeding.