Only after Mary read her composition the second time________the spelling mistake.(2012·天津,6)
The committee ______ five famous scientists put forward a valuable plan at the end of conference.
They suggested that the library ________ open during the vacation.
If I can help________, I don’t like to working late into the night.
Only by _______ your attention _______ what you are learning can you learn it well.
—Do you mind if I smoke here? — ___________.