It is difficult for any of us to eat better, exercise more, and sleep enough,________ we know we should.
The organization broke no rules, but ______had it acted responsibly.
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.
There are some police cars in front. What do you suppose _____?