Developing the Yangtze River Economic Belt is a systematic project which _______ a clear road map and
timetable.( )
calls for
calls on
calls off
calls up
Eye doctors recommend that a child's first eye exam ________ at the age of six months old.
—Where are the children? The dinner's going to be completely ruined. —I wish they______always late.
George is going to talk about the geography of his country, but I'd rather he ________ more on its culture.
— The professor gave a really good speech. — I suggest you _____ him some specific questions about his work experience.
I advised that he ______to the hospital at once,but he insisted that he ______quite well then.