Bob suddenly changed his mind just as we were about to __________ for the train station, which made me very angry.
His test results are not very _____. He does well one week and badly the next.
Scientists think they have _____ in their attempt to find the causes of some major dieases.
If you ever have the _____ to go abroad to work, you should take it.
In aerospace devices the weight of the necessary power producing equipment is _____.
Stressful environments lead to unhealthy behaviors such as poor eating habits, which _____ increase the risk of heart disease.