-What's the matter? -The cook _____five minutes ago, and there are fifty dinners still to cook.( )
Some researchers believe that there is no doubt _______ a cure for AIDS will be found.
To write his paper, he tried hard to collect _______ information as he could.
Don’t worry. You ________ have that book tomorrow.
Nearly all educators believe that a challenging situation can often _______ the best qualities of a person.
He found his son _______ inside the lift, _______ very worried.