Not until the early years of the 19th century ________ what heat was.
The hearings and comments often help managers avoid harmful decisions, leading them toward more _______ choices.
The new teacher was very quick to _________ the rules of the school
_____ about what he had done, the shy boy ran away as fast as possible.
Finnish President said Finland-China relations had progressed ___ with fruitful cooperation in new and high-tech fields.
What way are you thinking of ___ rid of this kind of pollution?