Inrecentyearsmuchmoreemphasishasbeenput______developingthestudentsproductiveskills.

When do you think ______ start the new attack?

Onhearingagreatnoise,Mikelookedforwardthroughthewindow_____whathappenedoutsidetheroom.

herehasbeenagreatincreaseinretailsales,____﹖

Professor Wang , _______ for his informative lectures, was warmly received by his students.