It was said that the accident happened _____ midnight, when it was snowing heavily.
A survey was carried out on the death rate of those who were infected by SARS, ________were surprising.
In recent years much more emphasis has been put______ developing the students productive skills.
_____ of water makes Death Valley a desert, but it is by no means devoid.
No matter how frequently _____ the works of Beethoven always attract a large number of people.
Under no circumstance _____ to tell lies to parents.