He has been acting strangely these days. I can’t _____ his actions at all.
Edison was a clever boy, and ______ he was fourteen, he had learned advance mathematics by himself.
I ______ to go on a diet, but the dishes at the party were simply impossible to resist.
Not until the teacher explained the importance of getting up early ______ we promise to come early.
—How about the party ______ at Mary’s house? —Wonderful ! Everyone had a good time.
This is the best way ______ I have thought of ______ the problem.