If the wound ______ become infected, do not hesitate to call me.
---I will have to think about it again. --- If you _, you may lose the opportunity to compete altogether.
Exploring ________space is exciting, yet dangerous. There is ________need for both robots and humans for space exploration.
My mother has always_______we eat every healthily.
One of the advantages of living on the top floor of a highrise is that you can get agood _______.
Listen to the two girls by the window. What language _________?