My brother _________while he ________his bicycle and hurt himself.
It rained that day and ___ the baseball game was called off.
It is not until the disease has progressed to AIDS ____a person begins to look sick.
It is not clear ____the effects of global warming will be.
All the scientific evidence ______ that increasing use of carbon dioxide ______ the rise of the earth’s temperature.
Without the ‘ greenhouse effect’, the earth ____ be about thirty-three degrees Celsius cooler than it is.