Scientists are trying their best to_______ ways to treat the terrible disease caused by Ebola(埃博拉).
________, or you'll be late for school.
Mr Fan ________ this watch in 2005. He ________ it for 6 years.
--- ________ give them some good books?--- —Good idea!
--- This dress was last year's style.--- I think it still looks perfect ________ it has gone out this year.
Tom has been here ________just one year, but his father has worked here________ ten years ago.