16. This experiment turned out to be____failure, but, as we know, success often comes after___failure.
They must have been here the day before yesterday,____?
Mr Bush is on time for everything. How___it be that he was late for the opening ceremony?
Iyou a beautiful present for your birthday,but I was short of money at that time.
I lost your address, otherwise I____you long before.
Very loud noise_____make people ill or drive them mad.