e governments and scientists not worked together, AIDS-related deaths ________ since their highest in 2005.

Cancer has become the top killer ________ I think threatens the health of millions of people.

Why is John so happy—He is lucky and he has _____ one minute to finish his work, no more and no less.

o us all is limited. So in the days _______, we must work out a practical plan for our study and keep to it strictly.

There are tomatoes. You need to get some for me.