. It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.
John said he'd been working in the office for an hour, _________was true.
-- Whether the sports meet will be put off has not been decided.-- Yes. _______.
I can’t stand the terrible noise ______ she is crying loudly.
It’s strange that she ____have failed to see her own shortcomings.
His teacher worried that the student spent too much time on the computer and not enough time _______.