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So far, we haven’t had any evidence __________ this drug is effective.
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Our two senior programmers __________ each other ever since they were at college.
__________ the Internet is an important part of our daily life, about 3.9 billion people are still not online.
A modern city should provide an environment in _____information flows rapidly and easily.
No sooner had her finger hit “send” __________ she realized she had forgot to include the attached document.
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