Some researchers believe that there is no doubt ________ a cure for AIDS will be found.
______ the boy to save the money, but he would not listen to me.
Some parts in South China have experienced ______ this year as they did last year.
My brother is on a special _______ to lose ________weight.
She _______down her book and ________in bed.
There is little time left, so the chairman asked me to __my speech to 20 minutes.