It’s said that a(n) _________of $1,000 will be offered to anyone who helps to find the escaped prisoner.
He knows nothing about it, so he can’t help _______ any of your work.
Before going abroad he devoted all he could _______ his oral English.
He spent every minute he could _____ spoken English.
He ran as fast as he could _____ to catch the early bus.
Everyone in our class was working hard and doing what we could _______ a good college.