We are anxious about the spreading of H7N9, hoping it’ll ______ less threatening soon.
_______ on time, this medicine will be quite effective.
When I handed the report to John, he said that George was the person _______.
He is a man of few words, and seldom speaks until _______ to.
Though I have often heard this song _______. I have never heard you _______ it.
“Why was a special meeting called?” “______ a new chairman.”