The problem is _____ we can master modern science and technology in a short time.
The doctor was _____immediately the little boy fell off a ladder and hurt himself.
The performance supposed to be popular _____ to be a great disappointment after it was over.
I ______ from the crowd an old friend of mine whom I hadn’t seen for ten years.
The scientists are now trying to discover what use could be ________ such material.
Although they wanted to keep it quiet, news of the job loses ________ very quickly.