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
I haven’t finished my report, but I promise I ______ it by the end of the week.
It's a custom in China to have some tea or other drinks before the meal ________.
—What’s all that noise about outside? —Oh, I forgot to tell you. The road to the railway station ______.
Since the time humankind started gardening, we _____to make our environment more beautiful.
We won’t start the work until all the preparations __________.