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
________ anyone come to my office, please tell them I'm not available before four o’clock.
Had he not come an hour earlier, he___the secret that his mother was always there.
---- What do you think of a house supplied by Lovell ?---- _______ you buy a home from Lovell, the company promises to buy it back at the same price after three years.
Had the government limited the sales of cars much earlier, traffic jam and pollution _______so serious now.
____today, he would get there by Friday.