John was so sleepy that he could hardly keep his eyes ___.
There were signs here and there, _____ visitors to look out for ______ rocks.
She has ______ that doctor for three months.
Although ______ for many years, the two old sisters recognized each other at once.
He lay in bed, with his eyes ______ up at the ceiling and his fingers ______.
—______? —Yeah, it seemed a little confusing to me at first, but now I get it.